Honestly all the single player aspects of SSB4 kinda suck. Classic in particular is at a low point, there is basically no replacement for Adventure mode (not that I wanted something large like SSE, I certainly did not) the target blast mode is absolute shit compared to the break the targets challenges in SSB64 and Melee, I haven't seen any particularly interesting event matches so far (I've only played about 10 so far), Master Orders turned out to be remarkably disappointing, Crazy Orders is slightly better and kind of works out to be an alternative to classic that you can only play sporadically, All Star Mode is a bit of a cluster fuck just on account of how many characters there are now, and even the end credits have been dumbed down to the point where it's just you fighting words in the normal engine now instead of flying through space shooting words.
I blame the fact that they wanted 3DS parity so badly.