650 is mid to low end.
There are the 630s and 640s which are the true low end.
However, as Brett stated above, the PC is nice, quite high end, being configured right, that AMD machine can work extremely well on games. HOWEVER, and again, as Brett stated, your 'gaming' PC is weak in the Graphics department.
Now, I dont know, why the hell sell a system as a 'gaming' PC with that crappy card.
Look, there a YouTuber, lvlcapgaming, which tried the beta, and he runs an i5 2500k with a HD7870 (which is like the 660Ti for you nVidia kids) and he gets about 14fps in large, near 100-people battles. Most of the time however, at max detail, their frames are about 100 or more per sec. It drops to near 20 in VERY extreme situations, and I cant stress enough the 'extreme'.
Now, considering you try to run a 650, which is quite quite inferior, you probably should run it medium at 1600x900, and it will still lag in large battles. Mainly because of the tiny memory interface and the lack of memory for the huge maps and lots of textures.
Hope it helps.