Hero Tier List
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The following is simply an opinion piece for 7.13b. It may be changed at a later point as the meta, or my opinion changes.
Terrorblade, Visage, Outworld Devourer, Zeus, Disruptor, Tuskar, Underlord, Phantom Lancer
Pretty Dang Strong Tier:
Bane, Dark Willow, Pangolier, Earth Spirit, Chaos Knight, Dragon Knight, Doom, Io, Kunkka, Omniknight, Juggernaut, Death Prophet, Pugna, Rubick, Witch Doctor, Faceless Void, Brewmaster, Lifestealer, Leshrac
Big Boy Tier:
Enigma, Vengeful Spirit, Lion, Shadow Demon, Phoenix, Tiny, Clinkz, Queen of Pain, Razor, Ancient Apparition, Shadow Fiend, Troll, Gyrocopter, Luna, Elder Titan, Lycan, Treant Protector, Puck, Tinker, Chen, Batrider, Lina, Rhasta, Keeper of the Light, Sand King
Don't Pick These Heroes Ever Tier:
Techies, Viper, Venomancer, Legion Commander, Bloodseeker, Meepo, Anti-Mage
Heroes that are not listed above are those that I've deemed playable, but either too niche or not powerful enough to be recognized.