Princeofnigeria
The illustrious
I said other because I'd say the worst UU is the Maori warrior. It causes fear in the enemy? What does that even do? They come too early in the game to make any difference so to me they're just like a normal warrior.
This thread ain't about strength, it's about blandness. The Maori bonus is very nice in combination with the 10% bonus near maoi, giving you a "Spirit of Adwa" style homeland defense bonus (-10% enemies +10% your units= 20% disparity) and this is only exacerbated later on when unit strengths are higher, thus they lose more. As for blandest, I vote other. Bowman. You will NEVER get to use this unit in time to do anything but some light barb hunting. Bland.