Well, I just watched the first episode of Season 2, and what I can say it that I found so many inconsistencies that it is becoming hard to describe. It's almost an inconsistencies show now.
Ok here's the first one I'm thinking about:
McKay goes placing the ZPM with two soldiers. The soldiers shoot at wraiths, it doesn't work and they get shot. Teyla arrives and shoots at the same wraiths, it works and they can go on safely.