1. I'm not sure about the quality of responses you're receiving about content because Trion purposely withheld content (most of the game) in the beta weekends so i don't believe you're getting an accurate response there. The game in my opinion to compare it to a recent MMO content length-wise is relatively similar to Guild Wars 2 however with more replay ability and fast paced PvP.
2. Smooth sailing for me, i understand there were some hiccups with the servers including some downtime and issues with certain setups but generally the game runs fine and i experience no lag during the time i played.
3. Yes, however they're mostly cosmetic or booster (bonus to gaining EXP/in-game currency) while there is one called Lockboxes which when you open them you get a random chance to generate normal to rare items. These can be purchased with the in game currency with some work though.
4. No, there are no monthly fees. It is buy to play meaning that once you buy the initial game you can play whenever and however you want. Although the console version for Xbox 360 requires xbox live gold to play which isn't related to Trion.
5. When i first logged in at the immediate launch of the beta weekend (friday morning i believe it was like 9am) there were easily hundreds, easily a thousand if not thousands of people shuffling around in the starter zone with me. I believe most of these people progressed further into the game so some people joining later didn't see how many people there actually were. So yes there is a playerbase and a significant one. Also remember that the show will bring in more players and so will review after launch.

