So, which legendary Pokemon do you think shouldn't have been legendary and why?
I'm going to go with:
Basically, I think that GF should have stuck with their formula for legendaries. One regular legendary trio (birds, beasts, golems, pixies), one more "superpower" legendary than the previous generation (Gen I had Mewtwo, Gen II had Ho-Oh and Lugia, Gen III had Kyogre, Groudon and Rayquaza and Gen IV has Dialga, Palkia, Giratina and Arceus) and one "cutsey", hard to find legend (Mew, Celebi, Jirachi, Shaymin). That's it. Regigigas gets a special pass for expanding the underdeveloped Regi myth but the rest don't.
Note, I like most of these Pokemon (except Heatran) and I don't wish they weren't created, I just think they should have been regular Pokemon, not legendary ones