The first season had basically 2 characters - yet it was perfect. Every story was locked to the childlike android personality that naturally led to fiasco, but in a comical development, and Monochrome's never giving up attitude in her ever miserable circumstances was inspiring, just as was the season's tear-jerking happy ending. The title was a success so the second season could afford: many new characters, OP+ED (vs just ED) and other things. But the magic of the original series was left behind in the Season 1. There're, sure, nice things that the fans must and will enjoy: a perfect OP; Monochrome inventing delayed joke as herthing; Mana-chan's cameo - that she rocked - expected nothing less from her; lots of little cyber jokes...

But it is all diluted in a lot of water, and - most of all - not held together by the original concept: as Monochrome became successful, she lost her charm and the sympathy of the audience. I think her mission was fully completed in S1.