Not sure whether "over the top" was meant as a complaint; I visited last summer, and thought the (obviously expensive) displays were pretty effective. The main grounds of the museum (the "tourist operation") also now has a bunch of interesting working replica gear, including a Bombe and some of its less publicized support equipment.

The computing museum is also interesting; BTW, in addition to the Colossus rebuild, they're also constructing a working EDSAC replica (using metallic delay lines instead of mercury tanks for memory, but otherwise as exact as possible), and have a bunch of other interesting old machines in the collection. For visit planning, though, it's open fewer days than the Trust-managed property.