Apparently a lot of people didn't get the deep undercurrent of social commentary undercutting Pride & Prejudice. Which, if you don't know much about the era it was written in, is pretty easy to do. If you think it's "just surface level romance" though, then you've missed the point. Virtually every development in the novel is a backhanded commentary on some social convention or other of Austen's era.

All that said, I can understand not finding that enjoyable - I personally prefer the miniseries as well. But to claim that it's not good, or to insult it by mentioning it in the same breath as Meyer's work - is just shockingly ignorant, unless you'd care to demonstrate the same depth of social commentary in Twilight (which is highly unlikely).