I haven't had any problems other than spelling errors and a wonky elevator.
How far into the game are you? I'm near the end and thus far I've encountered:
4 game-stopping bugs.
Countless graphical glitches (robotic animations, gliding, super-fast animations, out-of-sync animations, flickering textures, model distortion, etc).
Memory leaks (I have to restart the game after 4 hours of gameplay because I run out of virtual memory).
A myriad of typos.
Various audio problems (NPC conversations getting cut short, sound skipping during dialogue, lack of sound during certain dialogue, etc).
Simply put, the game is in a sorry state. Aside from the many technical shortcomings, I still find the game to be deeply engrossing and entertaining, a testament to the quality of the RPG buried beneath all the bugs. If the upcoming patch addresses all the problems, then the quality gameplay will finally be able to shine through. Until then, I'd hold off.
I've had ONE crash, that's it. No problems during gameplay at all. Game feels pretty complete to me, perhaps you are not using an NVidia card for the game? If you are then make sure you have the latest driver. I'd say any glitches are inherent from the Source engine because all the glitches I've noticed are the same ones I seen in HL2 before it got patched.
One thing odd is that I have 1Gb of RAM, yet the game recommends 512Mb, and on game exit there is a lot of hard disk thrashing like I don't have enough for the game.