It was definitely a step in the right direction! It was successful in transitioning Pokemon into a new area, which was R/S didn't do to well. Castelia City was a revolution, a whole new look that hadn't been seen before. This was displayed across all of the Unova region, from the marvellous bridges to the amazing Pokemon League. The Pokemon were very different to, looked like a different species of animal some of them. I can see what they were trrying to do but i'm not 100% sure it worked for everyone. The story line was refreshing to, not a revolutionary change but still enough to keep people interested.
Pokemon is definitely becoming a more complicated RPG, mainly due to the change of depth in the story. It wasn't ground breaking, this would have required major overhaul of the battle system, but It was still significantly revolutionary and certainly a step in the right direction.