"Twilight was good; entertaining, well stylised and not as nauseating as I expected. New Moon however was a disappointment; far too long with a corny script and some amazingly wooden acting - most notably by (gratuitously topless for most of the film) Taylor Lautner. Cringe worthy scenes of him taking off his t-shirt, running towards camera, his glossy locks flowing behind him like he's just had a promotional Pantene experience, prompted loud laughter from the audience. It was a packed cinema and I think everyone who wasn't comatose by this point had a hearty chuckle. However, bravo to Kristen Stewart who did sulky so well, and Robert Pattinson who makes an iron deficiency look very attractive.
In sum, I wouldn't waste your money going to see it unless you have an irresistible urge to self-harm. Even then there are cheaper and less enduring ways to do so.