It worked really well as shorts, but when the network decided to just throw them into 15 minute episodes, it took a while to get adjusted to the new style of writing that's needed for that. It was still funny but was a little hard to get into, and scheduling fucked them over in that regard cause CN didn't show it too much. >scheduling in general kinda fucked em over desu>Also people complaining that its too simple and no "DEEEEPPPEESSSSTTT LLLOOOORRREEEE"
It was in that weird period of time where people were EXPECTING every cartoon to be deep and be filled with backstory and all that stuff, and ended right around when people were getting sick of it, and silly lighted hearted stuff was just coming back. Magisword was just in the right place at the wrong time. Had it come out a bit earlier, or a bit later, it probably would have done better.
Vambre will always be my waifu4laifu though.