I find most the random stuff they do in Negima!? really appealing, but I think they are overdoing it way too much. The sheer mass they use of it distracts from following an already pretty confusing plot with such a high number of different characters (some of them more important than others, granted). I’ve much previous knowledge because I watched the first series and read most of the manga, so I can distinguish the characters quite well already, but I still get confused often. After all, Negima!? is pretty entertaining, but sometimes less is more I think.
Oh, and I really like the ED from episode 4 onwards.