I remember playing against a player one time who was Rammus. Rather than going full tank or whatnot, he had Thornmail+Randuin Omen and then 3 attack items that have damage+attack speed. Now, this build easily took down any single target but was ultimately useless during the team fights. But the damage output was insane as he'd take down any champ before the taunt finished.
Is this a viable build if you can use it and end a match before late game?