played a game with a krogan earlier, ran as a sentinel, smart guy stayed near the team at all times, provided valuable cover by stunlocking heavy enemies that were attempting to flank us.
Don't hate the class, blame the player. Bad people are just bad regardless of class set-up. Case-in-point, today I've run in to Salarian Engies not using decoy at all, and sprinting after 4 cap objectives that I, the infiltrator, was already pursuing. Salarian engie is considered one of the most supportive playstyles, but these idiots managed to play it like they were an adept and blitzed around like they were on bronze. Once again, can't blame the class, only the player.