I’m not a pro or GM (yet) and the following is my opinion as a Thrall main who has played him for years at high level (WR over all my accounts of 3 averages 65%+. This season average WR at 86% currently)
Referencing HEROESPROFILE he sits at a less than ideal 48% win rate in SL. And I think considering his kit and potential is a big underperformance in general. And in short answer I blame people trying to follow the meta builds rather than actually understanding how Thrall works first of all, and what situations require which talent.
How Thrall works? He is listed as a bruiser. His HP is bruiser worthy yes, and he has self sustain. But don’t let this fool you into thinking he is tough and survivable. He gets blown up by CC and pokes as easily and as fast as Illidan. If you outright play him as a bruiser and Frontline too much you’re up for some rough awakening.
You should think of him as a high sustain assassin, and yes through talents that I’m going to show you next that later in the game you can be both a full fledged bruiser (borderline tank) and an assassin into one which makes him a late game nightmare.
Talent tier 1
Talent Choice: Crash Lightening
This Talent has a very low popularity and winrate. And probably the most misunderstood Talent. Yes it is a quest Talent. You need to hit two heroes with lightning 30 times for it’s reward to come which is prioritize the heroes. But that’s not actually the real reward. The real reward is it’s damage increase every time you hit 2 heroes. Even if you don’t finish the quest the chain lightning will hurt. A lot. And this Talent allows you to become a late game ranged assassin with poke that would put to shame even Liming whether or not you finish the quest. It will also allow you to not take unnecessary risks as is the case when you choose the other talent Rolling Thunder which will require you to be close and personal with enemy heroes for its full potential. (Hidden pro: Late game chain lightning can be a finisher ranged skill to low HP heroes especially squishies due to accumulated stacks and damage)
Talent Tier 4
Talent Choice: Feral Resilience
Again, another unpopular misunderstood Talent with low win rate. This is where you start to feel like a bruiser. But not yet. This Talent allows you to not only stack faster frostwolf resilience for better sustain, but most importantly is a great counter to AA heroes especially the ones who rely heavily on AA (like ZJ, Ray, Valla, Butcher, Artanis etc…). You can almost never go wrong with this Talent because every comp unless all of them are mages will have heroes that rely somewhat on AA.
Talent Tier 7
Talent Choice: Ancestral Wrath
The most popular Talent for a good reason. This Talent makes Thrall a fully fledged bruiser that can grant you lifesteal while increasing greatly your chances of survival, allowing you to even take some risks or even start frontlining more often. Always a must pick!
Talent Tier 10
*Heroic choice: Sundering"
Possibly the best heroic in the game, and I’m not even joking. Most heroics are very situational, but not this. And rarely a heroic can have its impact or turn a tide of a team fight. Initiating a favorable TF? Check. Singling out a hero for a kill? Check. Killing a low hp hero trying to escape? Check. Interrupting another heroic? Check. Saving an ally from a death chase? Check. Saving yourself from a death chase? Check. Zonning? Check. AOE damage? Check. But there’s a bigger reward later.
Talent Tier 13
*Talent Choice: Spirit shield"
Again the most unpopular choice and the least understood. Congratulations. You just became a superior Bruiser Assassin that can actually tank with a wise use of this Talent. Every comp will have a spell caster or two. But that won’t be a problem for you anymore to start taking even greater risks and wreck havoc with your melee attacks after rooting your prey with W. You now are a hero melter with a very high survivability. But the best is yet to come.
Talent Tier 16
*Talent Choice: Alpha Wolf"
The most popular choice for an obvious reason. Congratulations, now you’re a fully fledged assassin with the survivability of a pseudo tank (better than a bruiser) that can melt other Frontlines. Your efficiency relies greatly on not missing your W skill. If you’re good at rooting heroes then again Congratulations. That is one of the skills that actually distinguishes a great Thrall from an average one.
Talent Tier 20
Talent Choice: Worldbreaker
The upgrade on Sundering. Now not only you possess the best heroic in the game, but you can spam it with a 40 seconds reduced CD and an added feature: it creates an impassable rift for 3 seconds that can be utilized in ways you couldn’t before. Now you can split enemy team in 2 and burst down isolated heroes while the rest of their team can’t come to their aid due to the rift. You can also save your team from a wipe late game by creating a rift between your team and enemies so they have 3 seconds time to escape.
I can talk a lot longer about Thrall, but the above sums up easily why he’s my favorite hero and why I have a very high win rate with him.