Sorry dude, Gnar sucks. It's kind of a pattern I'm noticing with the new champions. I've only been playing League since Harrowing 2013, but all the champions have had a common trend: bad, good, bad, good, bad, good. Here are the champions that have been released since I've been playing.
: Out of the meta. Jinx is a really solid hypercarry, but her lack of mobility outside of her passive when she kills a champion makes her much less viable than other champions.
Gangbusters: I think we all remember the great Yasuo QQ frenzy. He's still getting picked and banned like crazy.
Out of the meta. A nice homage to burst AP casters, but his lack of mobility just can't make him keep up in the assassin meta.
Gangbusters. the manliest support in League was hovering around a 90% ban rate because nobody had the common sense to play Morgana or Gangplank support. But their concerns about Braum being powerful are very valid, with his stuns, slows, knockups, and Yasuo esque wall.
Just awful. Not even out of the meta, he's built for top lane, but his stats are such garbage. His lack of AD is unjustifiable considering how squishy he is. Unless you build Gnar straight tank (which is how you DON'T have fun playing as Gnar) you're going to get killed with little problems on the enemy's part. Riot needs to start a new trend called "Gnaring" where you take an extremely bad champion and just buff them so much they turn into Kassadin, (like Olafing in reverse). It's the dreams of every Gangplank, Olaf, Poppy, and Urgot main everywhere.