Joe Haden ain't pissed the Browns got stacked after he got traded to the Steelers ... matter of fact, he's HAPPY for the city -- telling TMZ Sports he CAN'T WAIT to line up against OBJ!!
We spoke with the NFL star about his ex-team's newest addition ... and he's stoked for several reasons -- one being the fans having something to be excited about again. (After all, the Browns were awful in Haden's 7 years in Ohio).
"I'm happy for Cleveland. That's a great football city," Haden tells us. "They deserve everything.