All this talk of "it's not realistic enough" is getting silly... This is the problem with graphics getting closer to looking photo realistic. It's easier to pick out the slight deficiencies when it's so close to what we are used to in real life, but the fact is that all of the stuff your talking about are the trade offs you have to make to get that level of realism to run in REAL TIME on a flipping home computer...
Some of it is glitchy, but only because of the corners they've tried to cut to get performance out of the engine, and probably because you are trying to run the game on settings that your graphics hardware can't handle. Seperate card SLI and Xfire are always going to add glitches because the methods for splitting the workload aren't perfect.
To the guy who said that the little details like diving down from mid jump ruins a game for him... why in hell did you buy a science fiction game?!
If your not having fun playing with this (and I'll remind you again, it's a game, not a simulation of real life) you're doing it wrong!