Analysis by each position:
C - Barrett is good, but streaky.
1B - THome is great, and i doubt ud be last if he was healthy all year.
2B - I love Utley, but if you want to contend, get a 2B who plays everday.
SS - Guillen is awesome, when healthy. Id say he is one of the most underrated hitters...
3B - Hank is a stud, cant get much better at 3B (unless you got Arod)
OF - I like your OF a lot, but Dunn is looking like hes going to hit .220 and Finley is getting older and fragile. Id try to bring in some RP for Finley if possible..then play Pierre.
Util and Bench - Solid, but you can do better then Kaz and Polanco.
SP - I love the staff if they on pace...Mulder and Sheets are studs.
RP - Very Weak..definately try to upgrade that. Im not sure how your team scores Saves and what not...but you need something better then Turn and Mota.