Making terrain is a very tedious process. Nevada brings more than 'just terrain', but even 'just terrain' is very tedious to create. There have been at least 3-4 terrain-making projects started by the community that failed to produce anything, because it is just a ridiculous amount of work.
Try it yourself, see if you can make detailed terrain measuring 200nm on a side with roads, buildings, power lines, etc, then come back and say it's a joke.
They've had the one map (pretty much) for years if you include LOMAC, and the other map announced, Nevada is taking so long (despite being mostly desert) it's becoming a joke.
If the next fighter is F-18, I really, really hope they give us a Gulf map.