The system requirements of World of Warcraft grew massively in recent years. My father's desktop which he uses to play WoW has 8600 GT in it. He can play on medium settings of textures, spells, but has to go low for liquids, view distance and has to turn shadows off completely. 8600 GT is similar to 9600m GT.
For 100 euros? GET IT NOW! You won't get anything better even for 200 euros. Seriously, it's very good for the price. Even though you won't be able to enjoy high graphic settings, but at least games will work.
Well I have a mid 2009 Macbook Pro with 9600M GT 256mb GDDR3 + 9400M, 2.66GHz Intel Core 2 Duo (P8800), 4 GB 1067MHz DDR3 RAM and a 1440x900 resolution display. In OS X I run league of legends on Ultra (except for shadows, to keep the FPS above 60) and in WoW I have mostly High settings and some ultra. Both games are run on native res. On windows (bootcamp) I can max out both games (if my drivers are up to date) with little to no problem. This GPU can play Black Ops maxed out and MW3 maxed out, but I think thats as far as it goes for maxing out games. You shouldn't underestimate this GPU, I did and when I ran planet side 2 I had (by default) all settings on medium and native res with no lag. My friends PC can't even get close to that even though his computer is much newer and has better hardware.
Keep in mind that lots of these games rely on your CPU a lot too and my CPU can be compared to a bottom range i7 mobile CPU (I've even seen it beat one in a benchmark). Also I can run Ghost Recon Phantoms on Medium texture quality and native res and the FPS stays above 30.
The GPU itself is good but a good CPU is required for the performance in games to stay above par. I'm pretty sure that my CPU is keeping my GPU going because if I had a crap CPU I wouldn't even be able to reach high settings with my GPU. (keep that in mind)