If your aggro didn't drop to healers or dps and you didn't cause the healers to have a heart attack, I'd say you did perfectly fine. I haven't ever consciously used unchained or anticipation (I just forget what everything does as console playing doesn't allow me to double check skill previews from the cross hotbar) so your cooldown management is better than mine and I've never been called out for being bad.

Other tank was probably wanting to do that role and couldn't, or just an ass due to what seems to be a growing hate for people who have a crown. Probably worth checking their achievements and seeing what they've cleared in order to give them an opinion over your tanking, just for your own peace of mind.