I didn't say that MM would target gladiator.
I addressed a comment that said that Gladiator absolutely, positively would not be affected by a mental attack. From my reading, that isn't true.
The idea that the Annihilation team might win because of reaction speed is, frankly, absurd, when almost every member of the DC team has demonstrated super speed combat reflexes. Strikes me that you're reaching, there.
The idea that Surfer will 'know who to target' - even though he's never demonstrated any such ability before - but Martian Manhunter - whose vast telepathic senses MIGHT actually come into play, especially against another being whose powers are psionically derived (Gladiator) -- really says all that need to be said about the kind of selective criteria you're using here.
I'm sure, if you try hard enough, you'll fin d away to give the Annihilators all the advantages, sure. It's conceivable that, if the JLA just stands there and the Annihilators are more efficient than they have ever been, even individually, than it'll be a slaughter in their favor.
But going by normal portrayals, the JLA wins.
Going by all the CIS/PIS nonsense rules this board generally abides by, with a Flash and Green Lantern and Superman and Martian on the team? A Wonder Woman who can just start tapping into the Godwave? It'd be a slaughter, and not in the way you want it to go.