LoL is more about feeding one OP character lane exp so he can annihilate the other team late game. HotS is more about team coordination and fighting for ovjectives.

Its why the typical hots match is 22 mins long and league are 40+

Hots forces team fights to speed up action vs LoL where the first 20 mins of each game people are just avoiding eachother as best they can to score exp.

And fwiw, if you've managed to fall 2 talents behind, given the fact that the game has a built in fail-safe that gives teams who are multiple levels behind bonus experience for hero kills to help close gaps if they manage to win a team foght, then you deserve to lose that game

The game is definitely a lot more fun than it sounds.