Really? Yikes, I think you're in the minority there. I can't think of anything more boring than playing with the same team week in week out, with no way to solve your team's biggest strategic problems by buying/selling players, and just "making do" every week, and then it stops after fortyish games.
Taking a low team and do the best out of my given squad season for season is entertaining enough for me. This might be down to the problem that most career modes make it too easy to have a superstar squad after a short period of time. Then playing against Barcelona which is full of strange or unknown players...that´s not my thing.