- No icons. Makes it hard to differentiate between files and directories at a glance. - No drag and drop, you cant quickly copy and move files. - Renaming files is clunky (on OS X at least). - Right clicking a file doesn't give you many useful options. - Doesn't match the host OS's file manager very well. It's some sort of weird middle ground; on Windows it should act like Explorer, on OS X it should use the same conventions as Finder.
Compare the file manager to the ones in Coda and Espresso and it's fairly poor. I know the ctrl/cmd + p shortcut is pretty amazing but sometimes you don't know exactly what you're looking for and have to fall back to browsing through a codebase to find what you're after.
This post sounds a bit hateful, but I really like the rest of ST2. It's just the file manager which gives me grief.