I like the graphics and gameplay. I with you could travel on the mission and see other online players though. I think it would be more interesting to fight other guilds during missions.
I second this fellow here, specially on the second sentence, in my opinion its the only downside the game has, very adicting game and I guess thats all.
PS: If they would make it available to see other players during missions, at least 1 server with it available, the game would be flawless in my opinion. (Perfect in other words)