Sorry, your history doesn't support you contention. Vista is a re-write. Just because it's big doesn't mean it is in any way the same tangled mess of Windows 98 or XP because it isn't revision n of the same old OS.
Vista is a big bloated pig, but not in the way way that past MS OSes were.
Vista is also a slick OS when given enough physical resources. Vista has been met with luke-warm response so far but I suspect it will be the must have after SP1 later this year. Under all that useless eye-candy there are a lot of solid under-the-hood features that we plan to use, like significantly improved User Directory syncing and root-less terminal server windows, just like in xWindow.
Oh, almost forgot.. I'll think of that "rock solid and proven foundation" the next time my Network stack or Finder hang my machine up. Just because the foundation is solid.. that doesn't mean the wall don't have cracks.
ffakr.
what is it my kids used to say? oh yes. AS IF!