marine's barrel ability seems to be completely bugged out and doing absurd damage. Something like 600 a second. All you do is die. you just blow up. Kaboom.
I managed to bug out tau in a funky way. He lost that defensive stance ability completely. and went to -50 ammo before I died. Additionally, I think you should up tau's base damage about 10, keep all the other modifiers, just up base damage. It seems hes terribly weak in the start of the game. And yes, I'm very sure that tau is doing too little damage. Even 10 base damage might not be enough, I think him not having a real damage ability really trails off his damage. Ezekiel has his holy bolt, gnoll has his lightning spells, the tau has barely above average auto damage and then no real second ability damage.
-His ultimate seems incapable of hitting heroes. Can you increase the area of effect of the damage so it can hit heroes who are walking away from it ? Even heroes dead in the middle don't get hit it seems.
-Ok, if you get stunned while reloading and finish reloading while stunned he bugs out. I suggest you allow him to do defensive stance even if hes reloading, he needs the survivability increase anyway.
Skeleton bomb still doesn't work on normal skeletons.
Uh, are you sure you capped the bodies warlock can blow up ? If you are, perhaps reduce the damage maybe 25%. Hes still 1 shotting lots of people.
uhhhh swap tauren's pick up ability to 1.5 strength. For the king of melee he just seems to lose a lot in melee.
Paladin's heal should really scale.
The item with the stealth needs a limit of like 5-10 seconds in stealth. You are basically buying full stealth, which is very very bad for characters like warlock who can pull off ninja corpse explosions or something.
If I can be really honest, I just don't like the baby dragons from the fire dragon. It just doesn't fit in and leaves the character sort of lame. I'd much prefer it if he got an attack or something rather than the pets. I really want to like the fire dragon, but his only options are a big auto attack, and the pets. Just turned out rather boring with the pet ability.
-The playstyle of one of the strongest heroes with the biggest damage is sort of lost when you've got 5 baby dragons around you. Not only does the hero feel more of a pet hero, you miss out on a big cool ability. It goes from a badass dragon to just some sort of mother hen. I mean here you are controlling a bunch of baby dragons when you should be unleashing hellfire from the fire dragon!
-if I could be so bold, I'd suggest an ability that does a long fire breathe over a large area. Named something like "scorched earth" where the dragon for 10 seconds just torches AoE ~600 ish area.
I'd like to see chaos dragon reworked a little, I'm just thinking of how. Right now hes just a chaos and fire-helix machine. (Fire helix should scale off 1.5x strength BTW.) I'm thinking something like:
-Remove dark shell and instead add another over the top chaos dragon eske ability. I'm thinking something similar to dark shell but much more characterized by chaos dragon's style. I think an effect that you shoot the dark shell, but instead of doing just flat damage it does something much cooler. It puts a debuff on the enemy that lasts 3 seconds and after 3 shockings shoots them 400 AoE away from the chaos dragon. Sort of turning the enemy into a time bomb if you will.
Can you tune down black mage's single target stun ability's base damage but increase scaling ? That thing wreaks terror early game and can obliterate people very fast.
Nucular technition and warlock could really use a hot fix though. 1 shotting opponents leads to hate for the map. I'll just leave you at that then, since this ended up being longer than I thought it was gonna be

Nice new graphics BTW. You've gotten several compliments on them.