Well, surely you can understand people's point of view that 'You're only as good as your last work' no? Outkast's last work wasn't all that in case you didn't notice.
Check my Favourite MC's thread, I love Andre. I think he's #22 on my all-time list, which is pretty damn high if you considering how many great MC's exist. Aquemini, ATLiens and Southernplayacadillamusik, the albums which I presume you are referring to, are fantastic, I agree.
My favourite Outkast track is Git Up, Get Out by the way.