It's good.
But a question that you could answer yourself is: Do I have the money to spend on an upgrade?
If you do, and you'd be the only one here to know for sure, then why not? Do you feel like your games are being slowed down due to the processor's limits? If so then go ahead and upgrade. But one thing if for sure is that you don't have much options in terms of GPU upgrades with your CPU if you want to avoid bottlenecking. For example, my current 8800GTS was bottlenecked by my previous X2 4400+. Then I changed my CPU to an X2 4800+ (used) and OC'ed it to 2.85Ghz, I kept the same GPU, and suddenly my games' performance went sky high. The CPU architecture was the same, but a "mere" gain of 600Mhz or so gave me around 15+ extra frames in most of my games.
Suffice it to say that upgrading WILL increase performance, the real question is can you upgrade? If so, do it, especially if you play recent games like Crysis, although that one is much more dependent on good graphics cards than good processors (not to say that good processors won't help either, basically Crysis needs everything good, if you want to play it with maxed settings that is).