Why not? If it plays well, has a nice story, interesting setting or whatever else, doesnt have to be the best looker to be a good time.
I mean, you do what you want but feels like to me you make yourself miss out on good things that are out there just because they dont have top tier graphics.
Dusk isnt the best looking game, but its good. Just as an example.
If you cant get a new hdd now, i would at least try to get one soon.