Well, I play both a regen scrapper and an invul tanker. I don't feel "nerfed" in any way. Sure, my regen scrapper can no longer jump into a group of purple bosses and my tank can't herd an entire mission. I occasionally did that for fun/showing off. I *knew* the devs never intended it and never relied on it for consistent play.
On a more reasonable note, on "normal" missions I'm still having a blast and am still just as effective as I was in I4 soloing with my scrap or tanking for my SG. I now have to *gasp* actually think and work instead of just playing on autopilot. Much more fun, imo.
XP is better and debt is significantly less. No complaints here.
