Yes, Dirk is a little bossy. But he has to, its your life you are risking everytime you dive, specially in the cenotes.
Apart from that and the terrible food in the trip, everything else is fantastic.
For them safety comes first, fun and learning are in second place.
They are very knowledgeable about diving wich makes a difference.
I cant recommend you enough to go for the cenotes dive its truly amazing, the formations the separation between fresh and marine water makes it all blurry and makes you feel as if you were drunk but totally worth it.
Unfortunately we felt sick and extremely lazy for a couple of days so we couldnt dive anymore, but our experience was fabulous