While generally I think the design of these flashpoints is a blast, I was in multi-wipe mode on the last boss of Manaan (by far the most difficult fight of the four solo flashponts).
The boss (Stivastin) needs to be tanked underneath the fire to lose his shield and get stunned, but what if you're DPS or Heal spec? Oops. Companions aren't known for their precision of placement when tanking, and Kaliyo, who never likes to obey orders anyway, doesn't help. I died three times trying to pure DPS him down to zero (Sniper) but never made it inside the 5-minute timer.
Of course, you and your companion will also be snacking on the flames, but the bosses in the solo flashpoints are like Kuat Drive Yards with heals around the chamber. Even if you're not an excellent player you'll probably be fine.