The thing I think is so awesome about the Rocket is that there is just SO much you can do with it. It is a great package of comfort and performance out of the gate, but you can take it up to over 500HP (Like Warp did) if you are so inclined. There is just so much engine to work with and it is such a distinct and unique looking bike.
I will say that I stand 6' tall and have a 34" inseam and I can put my feet flat on the ground - barely. I think it is not so much that the bike is too tall as it is wide. The only place that I feel odd on the Rocket is when I have to make near still speed turns because it is a heavier bike (I am coming from a Triumph Speed Triple SE). That said, man the bike is a great experience and I am thoroughly enjoying it. 