I wonder what one could start flamewar about in such a topic.. hm...

RAD, YOU SUCK!!!111OMG HAHAH I FUNI ;===PPPP I think they weren't intentional. I mean, wallclimbing is hard enough to manage, why should they just put it into the game for the heck of it.. besides, it would be cheating in most levels and/or lock you into some place. I wonder what it's supposed to be good for anyways. =P
About the rest, also bugs. Even the characters get stuck. So why not the weapons. And I doubt they intended the mask-bugs that make critiques call the game "buggier than a jar of ants" or something.