play him on free week, he's not most people's cup of tea.
He is good, he's super tanky, can 1v1 most ad melees, but his skills might seem limited, or "not so fancy". His ability to damage is really to but his autoattacks and his little bite. Sure his very underwhelming ult steals a little hp, and buffs you for 6 seconds, all his abilities are there to really to help his melee autoattacks(and his bite which just replaces the next autoattack). The big ole column is fun to play with, but it does no damage, and half the time is just used as a deterent. If smash, smash and more smash sounds like fun, trundle might be up your alley.
His jungle ganks usually require some assistance, and is not as assured as say skarner who has a kill button. He has the ability to be scary all game long as an ad melee counter, but he does suffer a bit after the 45 minute mark when his bite is worth less and less.