While I really enjoyed Virgin Wall - mostly because of the reverse and down current which was a wild ride, same with the wall on Punta Tunich and dropping down 200' on Santa Rosa and many of the others (sorry to say Doc - I could not fnd anyone else to do Maricaibo Deep with me)
Garganta del Diablo was good fun (my 14 year old son - first time in the Carribean loved this one - he likes the more adventurous stuff) but ....my favorite is Tortugas over the way by Playa del Carmen (Blue Angel does this as a specialty) where you dive amongst huge turtle too numerous to count and 6-8' Tarpons (100s), .... but then again I like big fish, turtles, sharks, etc. so I am biased. Still everyone who does it raves about it.
Cheers,
Curtis
BTW, I also could not get to Barracuda but thats ok because I needed to leave a couple so I have a reason to come back with serious dive buddies.