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Good MCs (even BW2 male grew on me a bit after the animated trailers)
A good attempt at a fresh new pokedex, even if it had some misteps
Tying the the legendary/main story into the championship fight instead of having the story peak 3/4 through (though BW2 went back on this)
Hidden abilities helped give some weaker pokemon a new lease on life
the Memory stuff in BW2 based on your previous save was very neat
There was a lot to like in Gen 5 games