i can run all those games with my web surfing PC with no problem (phenom II x2, ati 5570, 720p resolution) which is more powerful then a PS3 or xbox360 (both also play all those games but SC2). the vast majority of games are simply console ports that have options (higher resolution, AA, AF, shadows) that make them more hardware demanding on a PC. also, the CPU is the robin to the GPU as batman. you can easily game at 1080p with a $70 CPU tied to a $200 GPU. a lot of PC gaming noobs & snobs like to pretend you can't game with out anything less then an intel 2500k & GTX570. It's not true as the majority of gamers still use dual cores with the nvidia 8800/9800GT or ATI 4850. developers create games that have to run across a majority of platforms for them to maximize revenue including the top consoles & average PC set ups.
all of that makes the FX 4100 a capable CPU. where you expecting stories of builders unable to post with the CPU? games unable to run or uninstalling themselves when they saw the FX CPU?
unfortunately none of that makes the FX 4100 the best investment for your dollar as I stated above. the phenom II x 4 840 is cheaper and offers identical gaming performance, the phenom II x4 955 offers better performance for the same price.
the intel i3-2100 offers better performance and the better upgrade path for the same price.