Intellegence being undervalued in Western RPGs.
Fallout 2 and VTMB stand out as notable exceptions, but generally the benefits you get from these skills being high are trivial compared to that extra point of smashy damage.
RPGs holding no sense of damage. My AK-47's burst should do more damage then an unarmed alley of any level.
4-teir tech tree. I don't know why this is, but apparently all advanced futuristic empires send armies out with absolutely zero information about how their own stuff works. It is especially egregious for Tau in Dark Crusade, where one only actually researchs teir 4 so one's own engineers can figure out how to CALL FOR THE TANK. They don't even build it, they just prep it for combat after ordering it flown in pre-built.
Total mediocraty of guns in games with any magic or magic-equivelent abilities.
"It appears, boys, that we've got the Gatling Gun off a Warthog. It does 20 damage, which although good, pails in comparision to Johnson's animated bunny corpse spell, which does 25"
Once again, notable exception goes to VTMB, where the styer aug is just as good as teir 5 thaumalugy (the game's "super weapon" magic)
FPS locked door syndrome.
"Hey, is that a pla...damn door, appears to be locked. A..hey, this one over here appears to be open. And what'd'y'know? The main NPC of this level is in this room! Funny how all locked doors, accidents, and traps push me along 1 exact route that always happens to land me in the main plot. "
GTA you are so totally immune to this cliche !