Despite fake-Luke being extremely lame now he's inevitably going to become a cool Action/Shounen Hero by the end of the show (or die). It's mainly Instant Gratification Syndrome which demands that he be snarked every step of the way on his journey since he's surrounded by so many other awesome characters.

I think almost all the other party members in the show are interesting and made more endearing because of whatever flaws or shortcomings they have. None of them fosters the urge to jump through the monitor with a machete like fake-Luke does for me at the moment.