Nice topic!
I have to agree with Boss, LTROI got plenty of attention when it was released. It's a brilliant film and deserves all the praise. Your opinion that it's underrated is, naturally, subjective so I can't argue one way or the other there.
Where we agree is on May and Ravenous. Those are two very intriguing movies and need to be mentioned more when people talk about modern classics. May in particular just leaves me breathless every time I watch it.
30 Days of Night and Event Horizon get exactly the amount of attention they deserve. Some.