Skill leveling: World of Warcraft
makes you click a button to do it, then expects you to sit and wait for the process to complete. EVE Online
lets you set it up and execute the function, then you can log off and expect it to have finished by the time you come back. Somewhere out there is an MMO that makes you physically work through the process of leveling up your skills, in realtime, but I haven't played that one yet.
Which is the best way to do it? By making things completely automatic, you remove yourself a step farther from the immersive nature of the game, but you save a great deal of time and an almost arbitrary level of purpose. By making things manual, you feel a great deal more invested in the outcome and your feel for the character, but you may be increasingly annoyed by the tedious nature of being forced to level up by hand. Some people even argue that skill leveling is one of the most important aspects of an MMO, and an inherent part of gameplay. On what side of the divide do you fall?