Evony does not have a good reputation, but it is probably the most prominent 4X MMO on the market right now. Its prominence makes it useful as a point of reference, but I wouldn’t suggest using it as a model. Then again, I’ve never played it, so all my statements about it are hearsay.
As a sidebar, I think Evony is an interesting look at micro transactions gone awry. When I first heard about the possibility of micro transactions, probably from Scott McCloud’s Reinventing Comics, I thought it was a pretty cool idea with a lot of potential. Fast forward some ten years and I still think there’s some potential, but the ideal has lost some of its luster for me. The dichotomy between Evony and Kingdom of Loathing, both browser-based games supported by voluntary micro transactions, illustrates this. In Evony, as I understand it, the rewards from voluntary donations so significantly enhance game play that donations are nearly obligatory if you want to play the full game. Contrast this with Kingdom of Loathing where donators receive optional items that do not, generally, affect one’s ability to play the full game.
Then there’s DLC, which sort of grew out of the idea of micro transactions. Again, I thought this had a lot of promise from the start, but the manner in which game producers have implemented DLC in the past few years have certainly soured my feelings for the delivery device. In particular, games that offer DLC with game play “enhancements” which really should have been part of the whole game itself really get me in a twist. Dragon Age I, which I have never played, has DLC that allows storage of items outside of characters’ immediate limited inventory; I think this probably should have been in the game from the start, particularly for a genre that places importance on inventory management.