I dunno... I've been using it for the main game i've been working on and it's not a simplistic game (much to my chagrin, i'll admit... because all I wanted was to just make a game... I didn't realize how complex the systems I'd have to make would become.)
... and most times when something goes wrong, 99% of the time it's because of a PEBCAK error (Problem Exists Between Cranium And Keyboard) or an RTFM error (Read The Freaking Manual.)
So, Though I'm not saying that they are incorrect in their review, suggesting that PM is unsuitable for complex projects is a bit unfair (especially if they've only been using it for four months... I have been using this for close to three years and I still am learning new things about this system.)
EDIT: HAHAHAA!!! This is my 420th post! sorry, just found that to be highly entertaining (if you know what that means, cool... if not, i'm not sure this is the venue to talk about it in detail.)