I really like Malphite, but I feel like a rock potato when playing with him
Unlike other tanks that can actually go on a champion and apply permanent CC, Malphite only has his ultimate as a way to get in a teamfight. Miss it, and you're pretty much done for the fight.
His Q is a single target spell that applies a moderate slow and his other dmg spell is a close range.
I really do think he could use a small update on few of his spells.