I've got no problem with the 92 and actually really like the gun, but I can understand SOME of the complaints.
The grip size is, well, huge. No other way to describe it. If you don't have paws, chances are that you aren't going to be comfortable with the gun.
The stock sights are tiny, and the front sight up until the recent revision required a lot of work to replace (as in gunsmith).
The DA/SA operating system isn't everyone's cup of tea, but that can be lightened up with some spring changes.
Open top has good and bad points.
All that said:
Every 92 I've shot has been 100% reliable and has been a tackdriver. Then again...
1) All those have been maintained properly, which isn't always the case with a service weapon.
2) Let's face it, most military folks can't shoot a pistol well. I know we've got a good number of them here who are the exception, but they aren't the norm. I submit that if you stick any other handgun platform in the hands of most of our troops, they'll still complain that the guns suck because they aren't shooting as well as they do with their rifles.
Now, a lot of the complaints I've heard are in regards to the 9mm round itself. THAT I'd be willing to lend some credence to, as the change from .45 to 9mm is certainly...um...interesting.

Don't you love NATO?
-Mark
Back to being just a guy.
No, not that guy. Or that other one either.