I've only attempted a couple Tactical Flashpoints at this point (toons are about lvl 51), but they seem surprisingly hard, at least certain bosses. Even with both companions set to heal, I still have a really hard time keeping up with the damage output of some bosses.
Most recently, the 2nd boss of Hammer Station. His dps seems pretty high.
I know I'm far from the best boxer, so I'm sure other people would be able to handle this, but I expected Tactical level of difficulty to be easier. If I wanted a challenge, I'd do the Hard mode. I mainly want to experience the story.

Edit - BTW, I only started boxing this game after 4.0, so maybe something changed with the patch.