I have been playing Entropia actively from early 2005 till mid 2008 and I have an intense love/hate relationship with them. Let me list my personal pros/cons:
Pros:
Videogame with real money.
CryEngine powered.
No shards, one world.
Mature playerbase, mostly US/EU.
Stable financials, the company is shareholder-friendly.
They are a registered Swedish banking company.
They have a deal with Chinese Cyber Recreation Development Bureau.
Cons:
Addictive as hell.
Quite random, i would say quite close to poker in variance terms.
You will never catch up with the oldskool players, you would have to deposit million $ to get the same items and skills as top people.
Slow innovation, no new core systems for a long time.
Long term tendency to overpromise and underdeliver.
Low new account growth.
They seem to be content with having low amount of heavily hooked players. This is a conservative strategy unusual for a revolutionary company. However, this may be just the right type of approach to make it work. They will probably end up being bought by Microsoft or someone like that if they play their cards right.