Breja: I'm not sure. Call of Duty Modern Warfare and Assassin's Creed are strong contenders, but I think The Old Republic might take the top spot. It is (or at least was when I played it) such a bland WoW clone, without any personality, just the most obvious, by the numbers MMO, only in Star Wars decorations.
Than again, the real most bland and forgetable games are probably the ones I can't remember now at all :D
It it wasn't for the fact that the COD games tend to do something blatantly
bad (No Russian mission and more), I think they'd be the blandy bland.
Tarm: Daggerfall. A enormous world filled with exactly the same ten buildings, ten people, ten trees etc.
I still loved the game but man it was so bland that getting lost was a gameplay mechanic.
Daggerfall, I tried to get into that, but it turns out that playing an open world RPG nearly as old as I am requires some
interesting control choices. I got killed by a rat. :V I'll probably try again soon.