Richmond Oval: Yeah, they have been having some ice problems, but they seem to have it all sorted out by now.
Luge track: It was a tragic accident, but the course has been in use for a while now and, although they have made several more safety precautions since the accident, and I don't mean to sound insensitive but some of it is due to human error, and
there is always risks in a sport like luge.
Downhill ski track: Obviously it is a hard track, look at the last games in Turin, though, where the track was much too easy.
Snow: Whistler has gotten pretty good snow, but Cypress has been a problem. They have "imported" snow from higher elevations however...there is enough on the tracks, though.
Overall, no games are without their problems and controversies. Vancouver certainly isn't an exception.
ETA:
The warm weather is not because of Global Warming it is due to El Nino (a weather pattern).