Two words: **** Ftilt. I would say it's in ROB's favor just because of offstage antics, but not by much. It's not as though ROB will completely dominate offstage, but he can make it difficult to avoiding hits every time we recover, and that damage can build up. If we get ROB offstage and he can't pull a Snake and go over us, more often than not that's a favorable position. Onstage, it turns into dodging lasers from afar to get in close, then we need to make sure not to get dominated by all of ROB's quick tilts (something I need to work on, badly). The gyro is kinda like Diddy's naners: Whoever controls it best wins in that aspect, and I think ROB has more options of control, though I think Jab can beat the gyro at times.
That's just my take; it might actually be easier than what I've described, but I've always struggled with this matchup. Though I should note the last time I played a good ROB was against Chibo late last year.
Back to the other topic: I haven't given blood, but if it's not too different from getting shots, I probably wouldn't even squirm.