Played around with him in a bot game, then stomped a normal.
I think leveling W first may be the way to go in any role, huge DoT damage on hammer W (Lol 380 damage at Lvl 5), huge damage and shorter CD on cannon W, which isn't a skill shot either.
Cannon Q is a poke skill shot and not a burst damage skill, and E+Q is really predictable. Hammer Q is utility only.
Leveling E only makes 1 damaging skill stronger.
and Hammer E is pretty hilarious, I keep thinking its a utility skill but then I forget it deals 20% max HP damage and end up getting all the kills LOL
Only tried him as AD carry role and have to say he's pretty fun and STRONG ._.
I just hate his splash.