I've only been playing ARAMs lately because of the crappy meta, but I got my boi Skarner in an ARAM, rushed Triforce and Steraks (Had a Thresh to tank for the team), and proceeded to 1v3 (They were weakened a bit but it was still awesome).
I was consistently able to run at the backline and fight them myself or drag them into my team, even the Kog'Maw (Although if they had an Ardent supp it would have been a different story). My build was rounded out with Mercs, Randuins, and Dead Man's, and was gonna finish with Warmogs (Adaptive would have been better in hindsight).
I've also used it on Hecarim (Also in ARAMs), but it seemed a bit underwhelming for some reason.