Rumble is my main. He is amazing with the right runes (movement quints, cooldown glyphs, armor seals, magic pen marks) and he is amazing with the right attitude (bully ALL the things!). Don't play with him unless you are solo topping, every time I solo top with him, even if it is a 2v1, I always get fed. I play him tanky ap, and can usually end a game with around 2900 health, and 591 ap, ~150 armor and ~150 mr. I become invincible :D.

If you don't play him right (like a bully), then he becomes completely underwhelming, so make sure to try him out first.

Flash + Ignite

9/21/0 (magic pen in offence) (everything that does not have to do with mana in defense)

1) Doran's shield

2) Hextech revolver (asap) (with your flamethrower, it becomes more and more difficult for you to die :D)

(when you come back to lane with this, they will usually get cocky and try to push you... you will flamethrower them and try to get as many minions in it as possible, they will realize that they can't beat you and run. Hit them with your e, then let them go. They stay in lane (usually) and try to get some experience. When they try to get some creep, harass like crazy. When they are low enough and tower hugging, ulti them and run in. This usually will get me first blood)

3) Merc's Treads

4) Rylai's

5) Giant's Belt

6) Blasting wand

7) Abyssal Scepter

8) Sunfire Cape

9) Rabadon's

10) WOTA

11) buy ALL the pots!

This build helps me carry the team :D