It's Sliding Doors without the middle-class smugness. It's Vanilla Sky without the general lack of redeeming features whatsoever. Eternal Sunshine Of The Spotless Mind was a beautiful and clever film with a good script and superb performances from the whole cast (expect the same shocked proclamations of "Egad! Jim Carrey can act!" that we got after The Truman Show and The Cable Guy). But I didn't like it. It wallowed in its cleverness, it wasn't nearly as funny as it thought it was, and like so many films today (especially of the "independent" sort) it quite obviously subscribed to the Happy Endings Are Bad school of thought as it dragged the plot kicking and screaming not to its logical end, but to a more cynical climax more acceptable to goatee-stroking film students.
It was a romantic comedy that didn't have the courage to be a romantic comedy.
After that disappointment I'm looking forward even more to Hellboy, which should offer a refreshing lack of pretentiousness as well as big monsters smashing stuff up.