Even if the zombies were all the adept had, and they couldn't hit anything ever, he'd still be contributing to some degree. Lots of people like something big, tough, and expendable to hide behind, or at least to provide cover from AoOs while they approach. The monk isn't very big without sucking up to the wizard (or burning wealth on pretending to be one), he isn't very tough ever, and being a PC he'll bitch about being reminded he's expendable.
I don't deny that, but let's see what has been argued in favor the adept so far:
-Never provoke attacks of oportunity for moving ever.
-He has some homebrew domination effect that's completely undetectable and never allows new will saves (nevermind RAW dominate allowing new will saves every time you order them do something they don't like, and sense motive DC 15 pointing it out).
-Has unbeatable disguise house rules, nevermind the actual disguise rules. And that nobody else can use.
-His undeads get to keep abilities at leisure that any other undead would lose.
-Can use polymorph on unwilling targets, despite it only working on willing targets. But, hey, screw the rules, he's the adept! He gets to play with his custom edition of D&D!
So really, the adept has been allowed so much plain munchkinery that's he's plain invincible. Not even pun-pun could beat him with all the rule breaking he's allowed in this thread.
Carve a hole in the hydras and let the party ride inside like some really gruesome mechs?
So let me see if get this, you're arguing that you can tear up chunk of flesh from a zombie, that is a mountain of animated flesh, and the zombies are just as fine as before?