The tower is not a terrifically designed scenario. It is extremely confusing to those who have not played before, and is a little hard to navigate even if you do know. That being said, it is not unpleasant when you get the hang of it, but that takes a little longer than it should. On top of that, the scenario is buggy. Often enough to be annoying, the launchpads that are supposed to take you to the main battle arena will instead launch you into the swirling maelstrom beneath the tower. There are also lag issues and other bugs that can get you stuck. The events surrounding the Oculus of Change are confusing as well - it is difficult to tell (if you are not immediately in the area) whether or not you will be transformed into something else, or simply blown into oblivion.
That being said, the tower can be fun if everything goes according to plan. Aside from the steep learning curve, there are no unfixable problems with the scenario itself. Once it rests rightfully in its Tier 4 place, it is likely that Mythic will have had time to fix these issues, and the scenario will be as fun and entertaining as all the others.