Best Of

One suggestion that might improve your portfolio is to use albums to batch together stuff, like animation, programming, high poly modeling, real time rendering, etc.

Another suggestion although its been already posted a few times already, is to trim down low quality stuff, like really old stuff that doesnt show your current skill level, that sort of thing. Since you mentioned that you dont really get what is "quality", i suggest looking at portfolios of people working in the industry (movies, games, motion grapghics, etc) and then you will get a sense of where the bar is.

And saying that YOU think your work is pretty good (despite what everyone else here have said) only shows a lack of self awareness and an adversion towards feedback. Not a good trait to be displaying...