I've got Lidge and Dotel on my roster. Dotel's a fine closer, and Lidge would make a fine closer. Dotel's problems are strictly mental -- he'll be fine. Both are dominant strikeout pitchers well suited to either a set-up role, or a closer role. That being said, if Lidge is available, why not add him? He's got 61 k's so far this year. That's more than a lot of QUALITY starting pitchers. Not to mention, with the Astros lineup, he'll leech a couple of wins and saves.
Lidge is a good add, and so is Dotel. These guys are both golden.