Explain this to me

This table contains stats for heroes' picks and bans.
Rank is used to sort heroes by winrate, taking number of their picks and bans into account. Higher rank means the hero is stronger. Rev-Rank (Reverse Rank) is used to show the least effective heroes with the most number of matches.
Number of bans is calculated approximately based on ratio of matches on the position to all matches of the hero.
Balance metric estimates how balanced the meta is (0 to 100)

Median hero picks (mp): 2 - Median hero bans (mb): 3 - Matches: 18

Remove low picks (0.9mp) Remove low bans (0.9mb)

Balance rank	Winrate	Pickrate	Contest Rate
26.8	35.4	19.5	15.5

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Storm Spirit	Core Midlane	14	77.78%	100.00	53.16	4	50.00%	2.0	10	90.00%	3.3
Shadow Demon	Support Offlane	17	94.44%	98.73	72.15	14	64.29%	7.0	3	66.67%	1.0
Batrider	Core Midlane	16	88.89%	97.47	78.48	5	80.00%	2.5	11	45.45%	3.7
Medusa	Core Safelane	17	94.44%	96.20	83.54	3	100.00%	1.5	14	42.86%	4.7
Keeper of the Light	Support Offlane	6	33.33%	94.94	12.66	1	100.00%	0.5	5	80.00%	1.7
Mars	Core Offlane	6	33.33%	93.67	17.72	4	75.00%	2.0	2	100.00%	0.7
Lycan	Core Offlane	6	33.33%	93.67	17.72	4	75.00%	2.0	2	100.00%	0.7
Lina	Core Midlane	8	44.44%	91.14	27.85	2	100.00%	1.0	6	55.56%	2.0
Bloodseeker	Core Offlane	10	55.56%	89.87	54.43	5	80.00%	2.5	5	37.50%	1.7
Void Spirit	Core Midlane	7	38.89%	88.61	26.58	4	75.00%	2.0	3	66.67%	1.0
Spectre	Core Safelane	3	16.67%	87.34	2.53	1	100.00%	0.5	2	100.00%	0.7
Disruptor	Support Safelane	10	55.56%	86.08	64.56	5	80.00%	2.5	5	20.00%	1.7
Treant Protector	Support Safelane	7	38.89%	84.81	50.63	4	75.00%	2.0	3	33.33%	1.0
Elder Titan	Support Offlane	2	11.11%	83.54	6.33	2	100.00%	1.0	0	100.00%	0.0
Tidehunter	Core Offlane	11	61.11%	82.28	82.28	3	33.33%	1.5	8	62.50%	2.7
Sven	Core Safelane	11	61.11%	81.01	88.61	8	37.50%	4.0	3	100.00%	1.0
Invoker	Core Midlane	10	55.56%	79.75	81.01	4	50.00%	2.0	6	50.00%	2.0
Queen of Pain	Core Midlane	8	44.44%	78.48	60.76	3	33.33%	1.5	5	80.00%	1.7
Elder Titan	Support Safelane	4	22.22%	77.22	20.25	3	66.67%	1.5	1	100.00%	0.3
Nature's Prophet	Core Midlane	2	11.11%	75.95	1.27	1	100.00%	0.5	1	100.00%	0.3
Faceless Void	Core Safelane	9	50.00%	74.68	77.22	1	100.00%	0.5	8	37.50%	2.7
Bloodseeker	Core Safelane	6	33.33%	73.42	51.90	3	66.67%	1.5	3	37.50%	1.0
Lion	Support Offlane	7	38.89%	72.15	68.35	5	60.00%	2.5	2	0.00%	0.7
Night Stalker	Core Offlane	13	72.22%	70.89	100.00	5	40.00%	2.5	8	30.00%	2.7
Ember Spirit	Core Midlane	11	61.11%	69.62	93.67	5	20.00%	2.5	6	66.67%	2.0
Venomancer	Core Offlane	6	33.33%	68.35	59.49	4	50.00%	2.0	2	50.00%	0.7
Juggernaut	Core Safelane	3	16.67%	67.09	13.92	1	100.00%	0.5	2	50.00%	0.7
Hoodwink	Support Safelane	3	16.67%	65.82	21.52	3	66.67%	1.5	0	0.00%	0.0
Vengeful Spirit	Support Safelane	2	11.11%	64.56	10.13	1	100.00%	0.5	1	66.67%	0.3
Dark Willow	Support Offlane	4	22.22%	63.29	32.91	3	66.67%	1.5	1	0.00%	0.3
Beastmaster	Core Offlane	11	61.11%	62.03	97.47	1	0.00%	0.5	10	40.00%	3.3
Vengeful Spirit	Support Offlane	4	22.22%	60.76	31.65	2	50.00%	1.0	2	66.67%	0.7
Shadow Fiend	Core Midlane	6	33.33%	59.49	69.62	3	66.67%	1.5	3	0.00%	1.0
Monkey King	Core Offlane	2	11.11%	58.23	11.39	1	100.00%	0.5	1	40.00%	0.3
Night Stalker	Support Safelane	3	16.67%	56.96	18.99	1	100.00%	0.5	2	30.00%	0.7
Axe	Core Offlane	1	5.56%	55.70	5.06	1	100.00%	0.5	0	0.00%	0.0
Wraith King	Core Safelane	1	5.56%	54.43	3.80	1	100.00%	0.5	0	0.00%	0.0
Bane	Support Safelane	1	5.56%	53.16	7.59	1	100.00%	0.5	0	0.00%	0.0
Undying	Core Offlane	1	5.56%	51.90	8.86	1	100.00%	0.5	0	0.00%	0.0
Viper	Core Offlane	8	44.44%	50.63	92.41	1	0.00%	0.5	7	42.86%	2.3
Weaver	Core Safelane	7	38.89%	49.37	89.87	2	50.00%	1.0	5	20.00%	1.7
Gyrocopter	Core Safelane	5	27.78%	48.10	70.89	3	33.33%	1.5	2	50.00%	0.7
Witch Doctor	Support Safelane	2	11.11%	46.84	15.19	1	100.00%	0.5	1	0.00%	0.3
Monkey King	Support Offlane	3	16.67%	45.57	34.18	2	50.00%	1.0	1	40.00%	0.3
Luna	Core Safelane	8	44.44%	44.30	96.20	3	33.33%	1.5	5	20.00%	1.7
Monkey King	Core Safelane	5	27.78%	43.04	79.75	3	33.33%	1.5	2	40.00%	0.7
Jakiro	Support Safelane	2	11.11%	41.77	24.05	2	50.00%	1.0	0	0.00%	0.0
Troll Warlord	Core Safelane	2	11.11%	40.51	22.78	2	50.00%	1.0	0	0.00%	0.0
Abaddon	Support Offlane	2	11.11%	39.24	25.32	2	50.00%	1.0	0	0.00%	0.0
Dawnbreaker	Core Offlane	7	38.89%	37.97	94.94	2	0.00%	1.0	5	44.44%	1.7
Terrorblade	Core Safelane	5	27.78%	36.71	87.34	2	50.00%	1.0	3	0.00%	1.0
Lina	Support Offlane	4	22.22%	35.44	62.03	1	0.00%	0.5	3	55.56%	1.0
Vengeful Spirit	Core Offlane	4	22.22%	34.18	84.81	2	0.00%	1.0	2	66.67%	0.7
Tinker	Core Midlane	2	11.11%	32.91	29.11	1	0.00%	0.5	1	100.00%	0.3
Lycan	Core Safelane	2	11.11%	31.65	30.38	1	0.00%	0.5	1	100.00%	0.3
Pangolier	Support Offlane	3	16.67%	30.38	56.96	1	0.00%	0.5	2	50.00%	0.7
Pangolier	Core Midlane	3	16.67%	29.11	58.23	1	0.00%	0.5	2	50.00%	0.7
Dawnbreaker	Support Offlane	3	16.67%	27.85	65.82	1	0.00%	0.5	2	44.44%	0.7
Dawnbreaker	Support Safelane	3	16.67%	26.58	67.09	1	0.00%	0.5	2	44.44%	0.7
Lifestealer	Core Safelane	4	22.22%	25.32	91.14	2	0.00%	1.0	2	50.00%	0.7
Silencer	Support Safelane	5	27.78%	24.05	98.73	2	0.00%	1.0	3	25.00%	1.0
Monkey King	Core Midlane	2	11.11%	22.78	55.70	1	0.00%	0.5	1	40.00%	0.3
Silencer	Support Offlane	2	11.11%	21.52	63.29	1	0.00%	0.5	1	25.00%	0.3
Hoodwink	Support Offlane	1	5.56%	20.25	40.51	1	0.00%	0.5	0	0.00%	0.0
Earth Spirit	Support Offlane	1	5.56%	20.25	40.51	1	0.00%	0.5	0	0.00%	0.0
Shadow Shaman	Support Offlane	1	5.56%	20.25	40.51	1	0.00%	0.5	0	0.00%	0.0
Phoenix	Support Safelane	1	5.56%	16.46	43.04	1	0.00%	0.5	0	0.00%	0.0
Oracle	Support Safelane	1	5.56%	16.46	43.04	1	0.00%	0.5	0	0.00%	0.0
Tiny	Core Midlane	1	5.56%	13.92	44.30	1	0.00%	0.5	0	0.00%	0.0
Undying	Support Safelane	1	5.56%	12.66	48.10	1	0.00%	0.5	0	0.00%	0.0
Snapfire	Support Safelane	1	5.56%	12.66	48.10	1	0.00%	0.5	0	0.00%	0.0
Sniper	Core Midlane	1	5.56%	10.13	49.37	1	0.00%	0.5	0	0.00%	0.0
Dark Willow	Support Safelane	1	5.56%	8.86	48.10	1	0.00%	0.5	0	0.00%	0.0
Slardar	Core Offlane	1	5.56%	7.59	36.71	1	0.00%	0.5	0	0.00%	0.0
Ancient Apparition	Support Safelane	1	5.56%	6.33	35.44	1	0.00%	0.5	0	0.00%	0.0
Mirana	Support Offlane	2	11.11%	5.06	86.08	2	0.00%	1.0	0	0.00%	0.0
Enchantress	Support Offlane	2	11.11%	3.80	75.95	1	0.00%	0.5	1	0.00%	0.3
Omniknight	Support Safelane	2	11.11%	2.53	74.68	1	0.00%	0.5	1	0.00%	0.3
Legion Commander	Core Offlane	2	11.11%	1.27	74.68	1	0.00%	0.5	1	0.00%	0.3