Not all good.
The whole movie was alight, but only because you put 4 movies in one.
The first Arcade one was ok. It had decent animation but the thing that buged me was the close up view. For that kind of flash it would have been better to just zoomed out all the way so we could see the action a little better. The "story" didn't make much sense to me ethier.
The Mario skater one was the worst of all four. It wasn't anything special just mario skating back and forth doing "tricks". Basically It was just plain boring. after 5 seconds I was just wating for it to End.
The Mario kart one was good. It entertained me and It had some pretty funny action. Plus you made the background yourself and animated it, so not bad.
and finally the last one was ok. Once again nothing special but It was at least a little funny.
Overall the animation in the movies was ok, a lack of sound effects but pretty good music. The bad part is that they were all pretty much boring and didn't entertain me.