B/W story was awful. It was ambitious, and I can appreciate the attempt to try something new with the series, but...
The simple truth is that B/W tried to bill itself as a story with morally gray villains and it completely failed on that front. Ghetsis is irredeemably evil and so is his team, making them no different than any other evil team we've faced throughout the series. Plasma is just slightly better at manipulating public opinion than the others.
We get loads of scenes with no purpose other than to reassure us that Plasma is 100% evil. Remember Ghetsis cackling to himself about how he's got everyone fooled? Or the time that a random grunt is trying to "liberate" a little girl's beloved pet? Scenes like that exist to discredit Team Plasma as a whole because if the player believes Plasma has a point, then the player, who is opposing them by being a trainer, cannot be wholly good. Pokemon is a series that you're meant to feel good about playing, so Nintendo is never going to make the player question the morality of their own actions. That's why Team Plasma's evilness is exposed and emphasized the way it is, and why this kind of story was doomed to fail from the beginning. You cannot have morally gray villains and purely heroic protagonists at the same time.
This sums up how I felt about it-- perfectly. I never play Pokemon games for the story, but I had no idea what was going on in Black/White
Slavery and wet dreams, I think. ---
Working in a team is great! It always helps to have someone else to blame.