The biggest problem tactically seems to be the overabundance of doors. Not doorways, despite most strategies revolving around them, but the closed doors with mini-armies stationed behind them which just kills the tactical setups in most encounters. I'm not asking for JA2 or anything of the sort but the design of almost every encounter generally discounts the tactical use of space at the moment, with the single point of approach elimination positioning as a consideration. It also marginalises the Survival skill because as useful as the information it gives could be, you're prevented from acting on it most of the time because of the door in the way.
Doors could be justified in numerous situations, such as mansions and other such dwellings but I'm not really seeing the rationale of them in say, ancient dilapidated ruined temples where every architectural feature within has or is in the process of crumbling away. Except the doors, which are as sturdy and functional as ever.
So yeah, curse you damned doors!