Its stale because isometric action role playing games haven't changed a single thing since Diablo 2 was released, except backdrops and superficial, cosmetic differences.
Maybe some people are happy with this, I dunno. I consider them obsolete in terms of gameplay, like adventure games (which can at least vary the stories and challenges).
There were plenty of great RTS games since Starcraft just none among those that chose to clone its three race approach. Age of Empires 2, Homeworld, Dawn of War etc.