Harem shows are always about the girls more than anything else. The "MC" is pretty much always just a stand in for the viewers and made to be normal and uninteresting. They are almost always designed to be blank slates from the start.
It doesn't hurt that a good portion of harem shows are based off of or inspired by dating sims.
Oh, I know, but it makes for trash storytelling. Granted, the 'transported to another world' genre is by far worse. Those are stright up wish fulfillment by the authors most time. I can probably count on one hand the number of interesting ones i've seen to date.
I actually even once thought up one, but beyond a setup i'm not sure where to take it. Trying to avoid the major negative tropues of the genre is kind of rough.
People love girls doing girl things, so Railgun S3 is practically guaranteed to happen after Index S3. I just wonder how much will they actually cover and hoping it will not be too terribly adapted (I still get angry at skipped Kaori vs Knights action).
There's the whole arc which tells a lot about Misaki and her involvement with Misaka and Touma both, ending with forced Level 5.5 Misaka going berserk, and whichever arc is currently ongoing.
I could not conceive of watching anime off cartoon network. But then, I remember first hand what they did to the early anime they showed. I still remember the early attempt at doing the Tenchi series, grimaces.
I'll stick with a mix of Crunchyroll, Netflix, Hulu, and buying anime...