I ask again: Will you buy Ultra or play a better game?
Most of us are FG fans, we'd do both.
Not to mention Ultra's coming after a long drought (esp if you're not a BB fan)- your only choice now would be importing Love Max, and there's no Dee Jay in Love Max.
As for the Dee Jay knee shot nerf, it's still buffed pretty huge off of what it was since it's got +3 more on hit so you can do good followups know. The ultra nerfs I don't know about those.
If I had to do a bet to avoid getting banned on GAF- I'd pick Dee Jay before I'd pick Dhalsim if I was forced to play one of the two characters, assuming I didn't know who the other person was picking and I'd be equally as meh with both characters.
(and no, I am not doing any ban bets in USF4)