Is my iMac ok for gaming?

Hello! I have a 2009 iMac with a dual core i5 2.66 GHz processor and the AMD Radeon 4850 with 512 mb of VRAM and 4 gb of ram, which I may be upgrading my ram amount to 32 gb in the future. Basically I have been going back and forth on whether I should or shouldn't game with this Mac. I currently game with my 2011 MacBook Pro 17 inch with i7 quad core 2.2 GHz processor and the AMD Radeon 6750 with 1034 MB of VRAM and a second graphics card the Intel Graphics HD 3000 with 384 MB of VRAM and 4 GB of ram which I will be upgrading to 16 GB of ram. Obviously my MacBook Pro is awesome for gaming but would you say my iMac is good for gaming? Thank's much!