Rumble is strong after buffs and consistently performs well, despite being perceived as a difficult "one-trick pony" champion.
Rather than trying to perfectly place 'The Equalizer,' simply focusing it on enemy main damage dealers to disrupt formations and cause damage loss is sufficiently threatening.
Beyond the ultimate, his Harpoon (E) and empowered auto attacks are very potent; utilize them for continuous pressure and damage.
Stats
Q
W
E
R