Was very saddened to craft a Megashark, only for my Unreal Adamantite Repeater to out-class it in usefulness.
Terraria Community Forums
FlakMaster
Sargon
Dungeon Guardian disagrees. 
LoveSpreader
One mob alone doesn't make up for it, methinks. Especially not one not even meant to be faced on a normal playthrough(or normal playthrough with boosted mobs).
Baconfry
Dungeon Guardian is not a valid excuse for anything, because good boys theoretically never find out what it even is.
Sargon
Well, I'm a bad boy!
Baconfry
Daddy Guardian is here to smack a bad boy's butt