Then again, you really only want to do this if you already have SharePoint, since that's the web presence (it's a module in SharePoint called PerformancePoint). But SharePoint has sold a metric shitton of licenses (I don't know why). You're right to be hesitant to bring SharePoint in, but for those who have, it works all right. Even for "real BI" (whatever that means).
The backend stuff works well, and there are a lot of tools that can pick it up--my personal favorite being Tableau. Also, PowerView in Excel 2013 is pretty nifty, and it's what I've been waiting on since Microsoft acquired ProClarity in 2006.