There's never going to be an real netplay tier list because there are different degrees of delay, lag, frame skip, and overall netplay issues, or depending on how much there is, affects specific characters more than others. A lot of people don't realize that my person tier list is different than what is listed on this site as well, it's just preference, not math or game science.
It is obvious though, that the more tactical charcters suffer online. Characters with tactics that are quite reliable and effective in normal play, are being shoved down for no reason other than this is what you guys experience online.
Side note, has anyone noticed with Sektor on XBLA version, you can't do a dumb missile after a smart missile? I haven't fully tested it, but can someone see if there are issues with it? There aren't in the arcade, and if he can't do this (fire dumb missiles while smart missiles are out) that hurts him. I noticed he can't in arcade MK3 and PSX MKT.