There is not, however all but the most basic content takes place within instances that cap your level. Open world stuff in quests is less "Oh tough fight!" and more "Storywise these enemies need to be defeated but they're no threat." Also, if you only use the gear you get from quests, and thus keep your item level at the same range as quests, you won't power through stuff TOO easily. The vast majority of your stats come from gear, especially later on.