||01-08-2013 08:36 AM
Use armpen runes, smartcasting and good combo: Q-E-W in canon form, R-Q-E-W. Then autoattack if the enemy isn't dead, then again R-Q (E has slightly longer cooldown than Q I think). Use canon E - backwards Q through the gate after you passed the gate to escape the enemies. (Yes, you can go Q-E in canon form if you use smartcasting, that enables you to surprise hit the enemy because the gate isn't telegraphing your intentions too soon). Go IE and other damage and critical chance items like brutalizer and Youumu's Ghostblade that gives you nice cd reduction to spam your abilities even more. Forget about Trinity Force, if you build that it's probably why you don't realize how strong he is.
Also, prioritize E-Q-W. R when poss or even forget about it (Jayce is pretty unique for that). You can also go Q-E-W, but by all means don't go prioritize W. And don't forget about smartcasting. It's the only way you can play good champ like Jayce with so many spamming abilities. In the beginning use E-Q as starting combo in canon form, but as I said it makes it possible for enemy to dodge your canon Q. Also, Q through the gate is great farming tool.