I got dragged to see New Moon yesterday. My girlfriend said it was repayment for her having to watch Top Gear every week. I figured fair's fair - how bad can it be?
It was genuinely terrible - a complete absence of plot, terrible acting, and the girl in it won't stop panting (which you might think is a good thing but it gets really annoying after a while). I haven't seen the first one but apparently it's worse than this one but I'm not sure that's possible.
Anyway, if you like vampire movies I'd recommend avoiding this one (unless you're a teenage girl that is).