Combat Engineer is fun when you play on the BLU team for Attack/Defend or Payload.
I love to play Combat Engy, but I end up having to set up a nest with a Mini-Guarding it
I like to set up teleporters because more often than not, I'll be the only Engy on the team, I mean, I might as well set them up, and then I'll hear "SPAH SAPPIN' MAH TELLYPURTER" if I'm not babysitting the loving thing.
Either that or "TELEPORTER DOWN :CCCC" because somehow a Demoman made it all the way to our spawn while we've captured all but the last point.