wedgeski
Adventurer
We've run into this one as well, and concluded similarly: you only get 5' of unthreatened 'movement' before being susecptible to AoO's. As someone else has noted, one of the disadvantages of being large is that there's more of you to hit.
Remember also that it can be impossible to withdraw cleanly (i.e. without taking any AoO's) even if you're Medium; it all depends on the positions of your opponents and your avenues of escape. When you're Large or even bigger, those avenues start to shrink unless you can move in more than 2 dimensions.
Remember also that it can be impossible to withdraw cleanly (i.e. without taking any AoO's) even if you're Medium; it all depends on the positions of your opponents and your avenues of escape. When you're Large or even bigger, those avenues start to shrink unless you can move in more than 2 dimensions.