I think your team will come around, at least I hope so, since I have a bunch of your players. Helton (who I own) simply has to improve, as will Huff, which will help your OF. Rowand and Patterson (two guys I was targetting in drafts) are showing signs, and might turn into the guys everyone thought they would be.
For your pitching, Radke, Lowe and Vasquez have been headaches to deal with (have all three), but I think they are too valueable to drop (at least Lowe and Vasquez, I'm still deciding about Radke). What sucks is they all decide to do bad at different times, so a good start from one of the three is usually wiped out the next (or previous) day.
Overall I think you should stay put unless you can acquire another closer for some combination of one of your SP's and/or a bench hitter.