I kind of feel that all Twilight criticism has been somewhat pre-empted by the hilariously addictive Reasoning with Vampires blog, but I shall do my best.
Eclipse is where the Twilight saga starts to lose what little interest it had for me. Supposedly, the plot follows Victoria's attempt on Bella's life, but there is so little of that plot here that's it not even worth calling it that. And even when she does appear, it takes this coven of six supposedly intelligent vampires literally HALF THE BOOK to work out that it is her. There are only so many people who want to kill Bella.
(Actually, that's probably not true. Approximately half the English-speaking world, including me, want to kill Bella. And the other half have been hypnotised by the sparkles.)
So what really annoys me about Eclipse is the fact that Meyer keeps telling us how angelic the Cullens are, without actually giving us any evidence. One example: they dismiss the newborn vampire plague in Seattle as literally "not our problem". Despite the fact that a) people are dying and b) the Cullens are probably the only people who can do anything about it. Now tell me the Cullens are the best people in the world.
I'm not sure why I've given Eclipse 3 stars. Possibly because I quite enjoyed giggling at its rubbishness.