They've fixed the marine early game in which the tactical buff was quintessential. But that unit scales extremely well into the late game and SM late game was already extremely strong. Another very important and needed buff was the lascannon devastators. They're now the best anti-armor infantry in the game, in a race that already has the by far best tanks in the game. As if that wasn't enough, the predator destructor, a unit people already spammed, got buffed as well!
It's just too much. Plasma tac spam+las devs+predator spam or whirlwind spam with solaria doctrine along with drop pods and deathstorm everywhere disrupting enemy formations...there's no way in hell eldar or ork can contend with this. They fixed the SM problems but didn't look at their power in late game 3v3 and 2v2.
Maybe team games doesn't for balance purposes at all. Seems like it considering the imbalance existing in 3v3 especially.