Am I allowed to say that I was disappointed the first time I dived on the Thistlegorm?
Before going there I had spent a few weeks in Cyprus diving the Zenobia, on that trip to Cyprus at times our group of three were often the only people on the huge wreck. I had heard how good the Thistlegorm is, so had very high hopes.
The first time I dived on the Thistlegorm was by day boat from Sharm, we had a really early start, got to the Thistlegorm at the same time as all the other day boats (this was back in early 2000's when it was very busy) on the dive it was very much a long queue of divers all following the same route around the boat, lots of waiting around as other divers made their way through doorways and the like. I seemed to see more diver than wreck. I wasn't really bothered about going back.
Since then I have visited the wreck several times by liveaboard, and really enjoy every dive on the old girl. Generally there are less divers in the water as liveaboards have a bit more flexibility on their dive times. The more you discover about the wreck the more interesting it becomes. Hopefully I will be going back this summer and my kids will get to dive it for the first time. The ship is slowly disintegrating, so I now view ever dive on her as special.
Before you go it is worth a read of 'SS Thistlegorm: WW2's Greatest Shipwreck' by John Kean. It certainly brings the story of the ship to life.
Here is a quick video I put together the last time I was there
I do enjoy the wrecks at Abu Nuhas as well, all of those are worth a visit too.