The Belial fight in SC2 was pretty funny, less of a pain than it was in D3. Seems like they did a retcon on the Zerg origin, though, but I guess they have to give the Horde treatment (non-evil race corrupted by the Big Bad, now redeeemd).
Kerrigan's interactions being "I don't like killing" or "OBEY ME!" is a bit worn. Abathur is kind of funny in the moments when he wants to analyze Kerrigan.