it can't do anti aliasing well. And doesnt offer the best performance for its money. But to say that it sucks goes a bit far.
Considering it can run every game without AA at 1920x1080 beside crysis and Arma2. But there are better alternatives. the 240 is thesame as the 9800 and 8800, so relatively differences in performance are mostly memory related.
In general personally i'd look for athe cheapest ati 5xxx series, or if you dont need the vidcard now and want it for hos only. Then wait till hos releases and buy a vidcard then, prices will have dropped.