I've found some bugs/glitches/exploits/whatevers, I don't know if these were already posted, but I feel the urge of reporting them:
1 - Some characters lost or don't have their "running + A" special they gained in V4 (mainly Max's Rolling Boulder).
2 - Still regarding Max's gameplay, he doesn't have his "SOR2 delay pause to emphasize blow connection" when using his Thunder Tackle. Also, his aerial throws (Thunder Body Slam and Atomic Drop) in SOR2 allowed you to score up to 600 points in a row if you press B fast enough while in air - and this is not possible in V5...
3 - SOR3 Skate doesn't have a "power blow" of his own, unlike the other characters -
- (even Zan gained a new "Cyber Kick")!
4 - The AI level is sometimes exaggeratedly hard for you to correctly hit enemies with some moves - specially SOR1 Galsia and SOR1 Nora, these seem nearly impossible to connect a combo without being too much bashed.
5 - Some enemy moves - like SOR3 Big Ben's Rolling Ball Attack and SOR3 Signal's Slide Kick - aren't invincible as they were in SOR3/BK3 (despite I'm not fully certain about the second one).
6 - Abadede's behaviours are very like they were in V4, i.e. almost impossible to approach or hit him...
I guess may be others, but for now I've only found these.
BTW, I endorse what was said previously about the bike/jetski scenes being sometimes hellish hard and impossible to beat without some life losses... but hey, these are gleamin' golden touches!