ive noticed some characters can roll easier than others. Ive had Lucina's roll right through my DK's UpB, even if she stopped RIGHT in it she managed to roll again before getting hit. Considering thats about as close to a constant hitbox you can get without a projectile around, thats pretty freakin fast.
Samus's roll is just obnoxious too. She rolls across the stage faster than any of my characters can run (dk, wario, lucario, dedede, yoshi) and thats one hell of a feat since yoshi is actually pretty quick.
Ive gotten to the point where i believe nintendo pits lv9 computers against you sometimes. Why do i think this?
1) Predictability is off the charts. CPUs tend to be very predictable, thats how i was able to beat 1v3 lv9 computers in brawl. I just knew how to dupe the AI. When they do the same exact approach/counter 10 times in a row, you tend to wonder if its really a player (regardless of the situation)
2) Insane timing, but not insane "knowledge" - what i mean here is they consistantly pull of some insane 1-3frame timing attacks, dodges, etc yet they cant combo or predict to save their life. I'll have one guy go from dodging everything so close i swear i hit him, to completely misguessing what im doing (upsmash when im not even in the air with a character that doesnt have a sweeping upsmash)
3) The rolls, which is why i mention this here. I could believe someone getting a couple of lucky rolls like i mentioned that Lucina did, but literally every single time? theres no way a player can be that perfect that many times.