BEST
Pokemon: No need to describe.
Bomberman Jetterz: Brings more to the character and I think it's kinda cute.
Kirby: It's almost exactly like the games. I just didn't like the lack of game characters included and the fact that they pretty much never left the town where the cappy people live. Never to the Fountain of Dreams or anything. Even the dub was pretty good compared to others.
Rockman EXE: It certainly did have it's good points. Acess sucked because it became repetetive garbage but it picked up in Stream. I really don't like that the humans kinda became more important than the net navi's.
Ryusei no Rockman: I thought the animation and overall story telling was WAY better than the games. And the fact that it's only 15 min per show leaves room for awesome fight scenes like Rockman vs. Cygnus.
Viewtiful Joe: It even carried on the same kind of animation. Not as good as the kind used in the commercials but still good enough. If it had lost some of the filler in between it would have made a great short series but despite that it was pretty good.
Sonic the Hedgehog (2 part OVA): Pretty good for the first actual Sonic anime. Sure the plot wasn't that great but seeing Sonic run across the Sonic CD inspired areas and fighting Metal Sonic was gold~ I do wish it was based more on Sonic CD. They could have left out Knuckles, Sarah, and the president.
Monster Rancher: Loved it, especially the dub~
Power Stone: If it had been closer to the game story wise I would have loved it. But other wise it was pretty good.
WORST/BAD
Devil May Cry: I thought it was animated way and pretty accurate for the most part. But it was only 12 episodes and we never really got a plot…
Sonic X:
Now this:
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Would have made a fabulous show but we can't always have what we want…
There were slow fight scenes, animation was meh to begin with but it didn't help that the staff was totally lazy. Annoying humans and messed up adaptations of the games. I can't believe they can't even get a show right. The 26 episodes to come after were actually some what good but no one has subbed through them all and it never aired on TV. So any place to find them is chinese bootleg... Now why would they have bothered making 26 more episodes to a failed show? And why bother with music and VA when they knew it would just be dubbed over? The 4kids dub was pretty bad too.
Parappa the Rapper: I was really expecting something out of this but I ended up with garbage. Pure garbage. First off the only characters to appear from the games are Parappa, his father P.J., the blue cat from Jammer Lammy and Sonny. All the other characters were anime only. It also had NOTHING to do with music in the least bit, the soundtrack wasn't even that great jeez… It was more like "the daily misadventures of Parappa and pals" than anything else.
F-Zero: Just wasn't needed. Boring. And Captain Falcon was barley in it. Never watched it till the end but that final episode with him Falcon Punching Black Shadow was awesome.