Selecting the right type of combat for you depends on whether you prefer a more aggressive PvP setting, where everyone can potentially attack you, or a more relaxed PvE experience that lets you cooperate with others against the evil AI. (Plarium)

Back in the day, prior to the invention of the internet – yes, such times did exist – most gaming was PvE (or story-mode) as standard. Of course, the stories weren’t as fleshed out and complex as they are today, usually along the line of “plumber must save kidnapped princess” or “shoot the invading aliens”, but they were great fun nonetheless. (PCZone)

Much of PvE is something that players can learn and calculate. Many people love the fact that things might not ever change but because of that they can constantly fine tune their skills because of the lack of variance. (Game Skinny)