When Did Jim Halpert Become an Idiot?

Because most Hosers have good taste, I assume most Hosers also watch The Office. Likewise, I assume most Hosers are wondering what the hell is going on with Jim Halpert. Ever since the new boss arrived Jim has been a bumbling mess. As far as character developments go, this BLOWS! I've always seen a lot of myself in Jim. Like me he is smart, he always gets his way, and he usually manages to highlight other people's flaws in the process. Plus, Jim got the girl, which is totally 10000% like me. Now, however, the writers have turned him into stammering idiot (and consequently I have no characters I can relate with). They better fix this fast.