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.
Balance metric estimates how balanced the meta is (0 to 100)

Median hero picks (mp): 3 - Median hero bans (mb): 6 - Matches: 55

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

Balance rank	Winrate	Pickrate	Contest Rate
55.7	78.8	30.6	36.3

Hero	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Bristleback	42	76.36%	100.00	43.30	11	100.00%	3.7	31	58.06%	5.2
Kunkka	50	90.91%	98.97	61.86	22	77.27%	7.3	28	53.57%	4.7
Dazzle	42	76.36%	97.94	78.35	9	55.56%	3.0	33	60.61%	5.5
Spirit Breaker	53	96.36%	96.91	88.66	6	66.67%	2.0	47	51.06%	7.8
Ancient Apparition	38	69.09%	95.88	75.26	23	60.87%	7.7	15	53.33%	2.5
Weaver	48	87.27%	94.85	83.51	17	58.82%	5.7	31	51.61%	5.2
Necrophos	32	58.18%	93.81	63.92	7	57.14%	2.3	25	64.00%	4.2
Brewmaster	36	65.45%	92.78	71.13	10	50.00%	3.3	26	65.38%	4.3
Wraith King	28	50.91%	91.75	64.95	20	70.00%	6.7	8	12.50%	1.3
Spectre	24	43.64%	90.72	53.61	11	63.64%	3.7	13	61.54%	2.2
Nature's Prophet	30	54.55%	89.69	72.16	14	71.43%	4.7	16	31.25%	2.7
Lone Druid	17	30.91%	88.66	40.21	4	75.00%	1.3	13	61.54%	2.2
Rubick	11	20.00%	87.63	26.80	7	71.43%	2.3	4	75.00%	0.7
Shadow Demon	18	32.73%	86.60	49.48	9	66.67%	3.0	9	55.56%	1.5
Primal Beast	49	89.09%	85.57	95.88	17	47.06%	5.7	32	43.75%	5.3
Invoker	18	32.73%	84.54	47.42	3	66.67%	1.0	15	60.00%	2.5
Naga Siren	35	63.64%	83.51	85.57	14	42.86%	4.7	21	57.14%	3.5
Grimstroke	42	76.36%	82.47	93.81	18	50.00%	6.0	24	41.67%	4.0
Chaos Knight	55	100.00%	81.44	100.00	3	100.00%	1.0	52	36.54%	8.7
Faceless Void	35	63.64%	80.41	86.60	14	50.00%	4.7	21	47.62%	3.5
Muerta	50	90.91%	79.38	97.94	16	43.75%	5.3	34	44.12%	5.7
Pudge	5	9.09%	78.35	9.28	0	0.00%	0.0	5	100.00%	0.8
Earth Spirit	19	34.55%	77.32	62.89	10	50.00%	3.3	9	66.67%	1.5
Templar Assassin	29	52.73%	76.29	84.54	16	43.75%	5.3	13	53.85%	2.2
Phoenix	34	61.82%	75.26	92.78	19	36.84%	6.3	15	60.00%	2.5
Clockwerk	14	25.45%	74.23	55.67	8	62.50%	2.7	6	33.33%	1.0
Batrider	13	23.64%	73.20	48.45	3	66.67%	1.0	10	50.00%	1.7
Treant Protector	26	47.27%	72.16	90.72	17	41.18%	5.7	9	44.44%	1.5
Puck	26	47.27%	71.13	89.69	8	37.50%	2.7	18	44.44%	3.0
Tusk	16	29.09%	70.10	76.29	12	41.67%	4.0	4	75.00%	0.7
Luna	14	25.45%	69.07	59.79	6	33.33%	2.0	8	75.00%	1.3
Timbersaw	14	25.45%	68.04	60.82	6	50.00%	2.0	8	50.00%	1.3
Dark Willow	34	61.82%	67.01	98.97	19	31.58%	6.3	15	46.67%	2.5
Centaur Warrunner	15	27.27%	65.98	73.20	11	45.45%	3.7	4	50.00%	0.7
Tidehunter	15	27.27%	64.95	68.04	4	25.00%	1.3	11	63.64%	1.8
Huskar	6	10.91%	63.92	14.43	1	100.00%	0.3	5	60.00%	0.8
Lion	2	3.64%	62.89	8.25	2	100.00%	0.7	0	0.00%	0.0
Marci	2	3.64%	62.89	8.25	2	100.00%	0.7	0	0.00%	0.0
Queen of Pain	5	9.09%	60.82	10.31	0	0.00%	0.0	5	80.00%	0.8
Magnus	14	25.45%	59.79	77.32	11	45.45%	3.7	3	33.33%	0.5
Razor	14	25.45%	58.76	65.98	3	66.67%	1.0	11	36.36%	1.8
Pangolier	22	40.00%	57.73	91.75	8	37.50%	2.7	14	35.71%	2.3
Lina	17	30.91%	56.70	81.44	8	50.00%	2.7	9	22.22%	1.5
Earthshaker	7	12.73%	55.67	42.27	6	50.00%	2.0	1	100.00%	0.2
Enchantress	10	18.18%	54.64	58.76	7	42.86%	2.3	3	66.67%	0.5
Snapfire	8	14.55%	53.61	50.52	6	50.00%	2.0	2	50.00%	0.3
Mirana	2	3.64%	52.58	5.15	1	100.00%	0.3	1	100.00%	0.2
Medusa	2	3.64%	52.58	3.09	1	100.00%	0.3	1	100.00%	0.2
Beastmaster	12	21.82%	50.52	67.01	4	50.00%	1.3	8	37.50%	1.3
Pugna	20	36.36%	49.48	94.85	11	45.45%	3.7	9	0.00%	1.5
Night Stalker	3	5.45%	48.45	12.37	1	100.00%	0.3	2	50.00%	0.3
Broodmother	3	5.45%	48.45	12.37	1	100.00%	0.3	2	50.00%	0.3
Phantom Assassin	4	7.27%	46.39	25.77	3	66.67%	1.0	1	0.00%	0.2
Skywrath Mage	4	7.27%	46.39	25.77	3	66.67%	1.0	1	0.00%	0.2
Dark Seer	6	10.91%	44.33	37.11	2	50.00%	0.7	4	50.00%	0.7
Slardar	10	18.18%	43.30	69.07	3	33.33%	1.0	7	42.86%	1.2
Morphling	11	20.00%	42.27	79.38	3	33.33%	1.0	8	37.50%	1.3
Bloodseeker	4	7.27%	41.24	35.05	4	50.00%	1.3	0	0.00%	0.0
Alchemist	1	1.82%	40.21	2.06	1	100.00%	0.3	0	0.00%	0.0
Bane	1	1.82%	40.21	2.06	1	100.00%	0.3	0	0.00%	0.0
Undying	1	1.82%	40.21	4.12	1	100.00%	0.3	0	0.00%	0.0
Dawnbreaker	8	14.55%	37.11	70.10	4	25.00%	1.3	4	50.00%	0.7
Lifestealer	4	7.27%	36.08	38.14	3	33.33%	1.0	1	100.00%	0.2
Outworld Destroyer	3	5.45%	35.05	20.62	1	0.00%	0.3	2	100.00%	0.3
Death Prophet	2	3.64%	34.02	19.59	2	50.00%	0.7	0	0.00%	0.0
Sven	2	3.64%	34.02	19.59	2	50.00%	0.7	0	0.00%	0.0
Ember Spirit	2	3.64%	34.02	19.59	2	50.00%	0.7	0	0.00%	0.0
Anti-Mage	1	1.82%	30.93	6.19	0	0.00%	0.0	1	100.00%	0.2
Legion Commander	6	10.91%	29.90	57.73	1	0.00%	0.3	5	40.00%	0.8
Keeper of the Light	10	18.18%	28.87	96.91	7	14.29%	2.3	3	33.33%	0.5
Monkey King	5	9.09%	27.84	54.64	2	0.00%	0.7	3	66.67%	0.5
Terrorblade	3	5.45%	26.80	41.24	3	33.33%	1.0	0	0.00%	0.0
Slark	2	3.64%	25.77	13.40	0	0.00%	0.0	2	50.00%	0.3
Vengeful Spirit	5	9.09%	24.74	80.41	5	20.00%	1.7	0	0.00%	0.0
Axe	6	10.91%	23.71	87.63	6	16.67%	2.0	0	0.00%	0.0
Phantom Lancer	2	3.64%	22.68	23.71	1	0.00%	0.3	1	100.00%	0.2
Dragon Knight	2	3.64%	22.68	23.71	1	0.00%	0.3	1	100.00%	0.2
Storm Spirit	2	3.64%	22.68	23.71	1	0.00%	0.3	1	100.00%	0.2
Viper	3	5.45%	19.59	39.18	1	0.00%	0.3	2	50.00%	0.3
Void Spirit	3	5.45%	18.56	52.58	2	0.00%	0.7	1	100.00%	0.2
Zeus	3	5.45%	18.56	52.58	2	0.00%	0.7	1	100.00%	0.2
Doom	6	10.91%	16.49	82.47	2	0.00%	0.7	4	25.00%	0.7
Underlord	2	3.64%	15.46	46.39	1	0.00%	0.3	1	0.00%	0.2
Omniknight	1	1.82%	14.43	34.02	1	0.00%	0.3	0	0.00%	0.0
Troll Warlord	1	1.82%	14.43	34.02	1	0.00%	0.3	0	0.00%	0.0
Warlock	1	1.82%	14.43	34.02	1	0.00%	0.3	0	0.00%	0.0
Riki	1	1.82%	14.43	34.02	1	0.00%	0.3	0	0.00%	0.0
Meepo	1	1.82%	10.31	16.49	0	0.00%	0.0	1	0.00%	0.2
Sand King	1	1.82%	9.28	34.02	1	0.00%	0.3	0	0.00%	0.0
Ursa	1	1.82%	9.28	34.02	1	0.00%	0.3	0	0.00%	0.0
Chen	1	1.82%	7.22	16.49	0	0.00%	0.0	1	0.00%	0.2
Jakiro	2	3.64%	6.19	46.39	1	0.00%	0.3	1	0.00%	0.2
Visage	2	3.64%	6.19	46.39	1	0.00%	0.3	1	0.00%	0.2
Silencer	3	5.45%	4.12	74.23	2	0.00%	0.7	1	0.00%	0.2
Sniper	2	3.64%	3.09	36.08	0	0.00%	0.0	2	0.00%	0.3
Hoodwink	2	3.64%	2.06	56.70	2	0.00%	0.7	0	0.00%	0.0
Witch Doctor	1	1.82%	1.03	34.02	1	0.00%	0.3	0	0.00%	0.0