Ethnic Vagina Finder
The Great Paper Chaser
You can't really say he was underused because he wasn't even in the original movie. His scenes originally featured a young Juggernaut breaking into the Pentagon, but when Marvel announced they were using Quicksilver and Scarlet Witch in Avengers 2 through a loophole, Fox did reshoots of all of Juggernaut's scenes replacing him with Quicksilver as a "fukk you" to Marvel.
Well the speaks to how Fox doesn't even know how to utilize what they have. The got the best collection of characters but don't know how the use them right Instead of being creative and thinking outside the box they would rather milk Hugh Jackman/Wolverine in EVERY X-Men flick. And it took Marvel Studios to force them to put in a character that had one of the best scenes in the movie