Monogatari series is actually on the easier side to me.. The MC's speed was somehow fast, but the CV said fairly clearly, and most weird terms get explained.
Those with lots of special terms or "dead words" here and there without proper explanation are harder to follow, like Nichijou.
I never interested in AKB, but I think the anime was quite good, or at least a nice try, especially season1.
Personally I don't like HD800 w Crack combo, sounded so bright and messed up, solid state ftw =_=