While I agree that the default style/scheme is pretty ugly, I'll be working on/looking in to better styles later on. However right now, it's of low priority. A style could also add a quick link to go back to the forums at the botom of the pages, as well as the top.
However, as forums go themselves, vbulletin is absolutely amazing - the amount of power, and functionality available - not just to the forum users, but to me as an administrator, and to any forum moderators, is overwhelming, in a fantastic sense. The forums will be able to be customised and utilised in many more ways, not to mention the moderation will be so much better and more "professional" for it.
So yes, I agree that the default vbulletin style is far uglier than the default PHPBB style, and there are a few "changes" that will either need getting used to, or possibly changed through settings... but I disagree with the overall gripe and I personally really love these forums.
Definitely some work needs doing, but they are here to stay! I will more than welcome suggestions for setting changes or little modifications, particularly from anyone who is even remotely experienced with vbulletin forums and knows what sort of things can be edited (and how)!