Like everyone else I find it easier to think of bands who's chase for financial success appeared to take them down different musical avenues from those which I enjoyed. However. I got into Pulp once they became commericially succesful. I've listened to the albums which preceded their breakout, Different Class, and while there are some good or interesting tunes their later stuff, and Jarvis' solo work, is much more to my liking.
Early in my musical odyssey I liked Sweet and T.Rex, but was quite perplexed by their pre-fame offerings. In fairness I was about 8.
I don't dislike Thin Lizzy's early albums as such, but Johnny The Fox and Jailbreak transformed them and for the better - to my ears.
Oh and the Soup Dragons were better once aboard the baggy bandwagon.