Final Fantasy XIV's beta, especially with players freely able to share their experiences. The fact that guildleves are on a 48-hour timer and the lack of easy and efficient mana regeneration are two of the more persistent ones, and a recent interview with Hiromichi Tanaka at Gamescom address just those complaints among others. But it's not all roses and sunshine -- if you're one of the testers hoping for the guildleve timer to be reduced, you're flat out of luck.
Tanaka makes it clear that several of these issues are part of the intended design -- guildleves, for instance, are doable solo or in groups, but they aren't meant to just be burned through solo each time they're up. As a result, the team is looking into how to give better incentives to group up and share guildleves. MP regeneration is meant to be difficult, and spells are supposed to be a choice of using up limited resources. There are several interesting answers in the interview, but not every Final Fantasy XIV player will be happy with the content of those answers