Love'em. Reading screenplays can be a lot of fun or, as pointed out above, absolute agony.

The type of screenplay I find most fascinating are written by established screenwriters that are in any stage before release. If you are interested in the film industry, screen writer, or just a fan, I find these to be the most informative.

Otherwise, like authors, I have favorite screenwriters that I want to read anything they do. Including the Coens, Helgeland, Tarantino, Crowe, Farrelly's, PT Anderson, Chandler, and a few others I'm forgetting.

Good luck to those writing screenplays. It's a tough road, but a rewarding one.