Actually, Ambush is the one and only gap-closer, that will stun you if used from stealth .. and sometimes if you get hit by another CC while still under effect of that stun or during the break-free an
I experienced a templar in IC sewers CC me, to the point of no dodging or breaking free was possible and killed me. His damage was not very high, but his CC knowledge lead to my death a couple of time
This is truly a l2p moment. If ten people are throwing out weak attacks and giving out cc immunity, just not coordinating, then the 1 person has an easy time picking the group apart.