well your phenom was stronger as a gamer than the i3 2100
and the i3 3220 isnt a lot strnger than the 2100 so you have probably reduced total system performance . And definitely done that if you are gaming online where the phenoms 4 cores would have been a big help
Your smart upgrade would have been to buy an FX 6300 or 8320
If you put $15 more, you will have an ideal gaming solution.
I really like AMD parts, but at this moment the i5 3570k is the ultimate gaming solution at that price point and is a 77w proccesor (very efficent) you can also overclock it since that is a nice sink (Cooler Master Hyper 212 Evo ).
The motherboard i choose is one of the best price/performance z77 boards on the market and is pretty good at overcloking if you want to do so.