Every so often against a bad team you see a few conqs get 20+ kills, but that's mainly because they are focusing the easy/quick kills to keep getting the chargeKB. Most of the matches I have been with this going on I have lost because the conqs are just farming kills and disregarding the team. And there's maybe a handful of conqs on set you could count on one hand who get kills regulary in minis...
The brute spec conqs are annoying on CTF, but most are so awful that it's just an annoyance, except when they actually land something and it crits, then with gear they hurt.
Seen most people move to rogue type classes lately though, probably in anticipation for unchained minis. Hopefully unchained does not turn into one bug hide match like some BR do time to time. Especially late night.