Well I plan to play other games too, such as Hawken, Mechwarrior online, GW2 and so on. I can -play- them all but only at a very low FPS with minimal settings which kinda sucks. :L
Yes, maby not to 660ti but it is worth upgrading to a more modern card. I went from 8800gt (newer one, basically same as a 9800gt) to a AMD 6850. And holy cow I saw a difference. (660ti is btw much more powerful card than 6850).