I'd be inclined to agree if it were a different sort of game, but i think with such a huge emphasis on strategy, base building and resource gathering it lends itself well to a turn based system. Also - though this is a bit more personal - because it's not a straight-up action game, i prefer the thrill of managing AP and wondering if i'll have enough to kill every zombie in that (un)living wall that's got me trapped in some alley. Or if i should've kept some of the bullets i traded for antibiotics back in town. Then again, as a pretty big fan of isometric CRPG's in that vein (Fallout 1+2, Baldur's Gate 1+2, Planescape: Torment, etc.) i might be pretty biased and looking for any justification to sing it's praises.