Is this iMac good for gaming?

I'll mention some games to get an idea: BF4, Minecraft, Portal 2, GTAIV or V. At least at low quality.
Thanks by forehand!

It's a "21.5-inch Late 2009" iMac.

-Processor: 3.06 Intel Core 2 Duo
-Memory: 4 GB 1067 MHz DDR3
-Graphics: NVIDIA GeForce 9400 256 MB
-Serial Number W8947MKV5PC
-Software: OS X 10.8.5 (12F45)

It also says: "TM and c 1083-2013 Apple Inc."
So, I don't quite know if it's a 2013 one.

ALSO: if it's not good enough, could I improve it (adding RAM, or something)?

Note: I know it's better to build my own. I'll maybe do that. But I have the opportunity to buy this and I'm curious.

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