I've always wanted to use Rampardos. TR seems good in the lower tiers and Head Smash more usable because you can invest in HP, but in in OU Ferrothorn and Conkeldurr are two new issues, even beside the regular array of priority moves.
 
Speaking of Conkeldurr...
252 Jolly CB Rampardos Sheer Force Zen Headbutt vs. 252/4 Conkeldurr:
101.9% - 120.3%
 
Since Fire Punch is illegal with Sheer Force, CB Hammer Arm mauls specially defensive Ferrothorn (sometimes OHKO with Adamant) and 2HKOs physically defensive variants.
 
Rampardos is so tempting to use in doubles. Yeah, he's priority weak and dies to EQ and Surf. But, if you use Sheer Force, your Rock Slides become extremely scary for both foes. And if you use Mold Breaker, your still powerful Rock Slides can flinch Pokemon with Inner Focus, and of course you ignore sturdy and your Earthquakes hit levitators. It probably wouldn't work against a human player (or be better than Terrakion), but maybe in the Battle Subway or something where the AI can be abused. Dedicated team support and/or Protect (he's an attack magnet) help.
 
And just a note, Rampardos and Pinsir are the only Pokemon whose SR can't be reflected by Magic Mirror. Neither of them are great at putting it up, unfortunately.