They are buffed in some ways, and it's not in the player's advantage to train against them.
- The air dodges are really hard to punish. When I try to bait it, they don't air dodge at all, and when I attack, the do frame pefect air dodges. Sometimes they don't, but most of the time they do. It's almost like they can read your inputs and react immediately (at least, it's the impression I get).
- You can't pummel them. If you try to pummel below high percents, like a hundred, the simply get out immediately; you have to throw them right away. Above a hundred, you can usually get a pummel or two, but you're still limited. This creates a bad habit of not pummeling at all against human opponents.
- They have a good defensive game, and an awful attacking one:
If you just sit there and shield/roll/walk/spot dodge/short hop when they come closer, the AI usually doesn't know what to do. They will simply walk back and forth waiting for you to do something. Projectile-heavy characters are a bit better at ''doing something'' when you don't, but it's still funny how easily you can take no damage at all by not fighting.
When you attack, however, their punishing game is really good, and their playstyle seems to be based on that in a way.
There's more things, but these are the three major problems I observed.
Also, they don't really know how to combo (I have never seen a Diddy CPU doing a Hoohah), and they are quite easy to beat when you take your time, because they don't know how to adapt. Even if you keep punishing one of their moves, they'll continue to do it.
For these reasons, I do believe they have huge buffs, but also weaknesses that are easy to take advantage of. The level 8s are much better, because they do less ''inhumane'' stuff, so it's both more enjoyable and you get less bad habits. Lower than that it's too easy. The best is still to play against human opponents though.