Havoc Gnoll Prey-Taker has +18 vs AC
Loremaster Accordant has +16 vs Reflex
Nothik Gazer has +17 vs AC, +16 vs Fort
Banshrae Dartswarmer has +16 vs AC (this seems to be the low end)
These are all level 11 artillery, and for artillery, +16 vs Reflex seems to be about on par, and daze is not an uncommon effect at this level (some of the above are even worse, and cause -2 attack on top of daze).
Level 11 Soldiers also have similar attack bonus, around +18 vs AC. Skirmishers and Controllers are slightly lower at around +16 vs AC or +14 vs Reflex, and Brutes are even lower at around +14/+15 vs AC.
Actually at every level, artillery and soldiers have slightly higher attack bonuses, and brutes have slightly lower attack bonuses than the other roles.