Well it doesn't seem like Mew was really given much of a chance then, unlike Latias or Deoxys-S who were brought down and thoroughly tested and found to be broken. Therefore I'm not really inclined to believe that his Baton Pass sets are what "broke him" since evidently not a lot of time was put into testing them in OU.
What I've seen of Mew so far is that it can be really effective with all of his options, but I don't think "tons of options" is a broken attribute in of itself (Celebi has like, 11 sets in its current analysis). Other than the huge movepool, Mew doesn't really stand out anywhere. It has an unspectacular typing offensively and defensively with an unspectacular ability and solid but unspectacular stats. There isn't anything about it that screams Uber right off the bat, not even an argument that includes what was so broken about it last generation because, as I said, I don't think it was given as much of a chance. If it could do everything at once, then yeah, it would most likely be broken, but that isn't the case.
What I've seen of Mew so far is that it can be really effective with all of his options, but I don't think "tons of options" is a broken attribute in of itself (Celebi has like, 11 sets in its current analysis). Other than the huge movepool, Mew doesn't really stand out anywhere. It has an unspectacular typing offensively and defensively with an unspectacular ability and solid but unspectacular stats. There isn't anything about it that screams Uber right off the bat, not even an argument that includes what was so broken about it last generation because, as I said, I don't think it was given as much of a chance. If it could do everything at once, then yeah, it would most likely be broken, but that isn't the case.