3) "Stop! You'll get shot by a thousand snipers if you go that way!"
Instead of rushing into the enemy's fire, you try to go around. Unfortunately, there are a thousand mines and death traps waiting five feet off the path. Lucky for you that army of hidden sharp shooters don't just, you know, move a few yards to where you're supposed to be standing. The same rule here applies to invisible walls, greased mountains, and other artificial ways to keep you from exploring a world. All the rendering and graphic power in the world can't hide the fact you're in a tiny rat maze.
2) "That Protoss just called you an antiquated Earth slur."
As your Zerglings scatter and your Hive Mind breaks upon the Zealots superior might, you only hear one word repeated again, and again, and again: "Gay." No matter what game you play online, if there is chat, you will get lots of bigotry and creative expletives thrown your way. Sure, playing with your friends help. And the mute button is a miracle. But no matter what the setting is be it medieval times, the future, or an alternate dimension every knight, space marine, and world leader seems to have a fascination with twentieth-century racism and homophobia. It's nearly impossible to lose yourself in an science-fiction war fought by genetically-enhanced Spartans when everything you hear sounds like kids auditioning for a birth control ad. And while no one's expected to role play their games online, the constant barrage of hate makes any online world a hate-filled shadow of what it could actually be.
1) "As a well-trained warrior, you probably know you press B to swing your sword."
Good morning, Planetary Marine. In five hours, you will be on a suicide mission to Terror 6, where you will use your decades of training and experience to defeat the vile heretics. But before that, let's review how to jump. Press "A" to jump. Do you need me to repeat that? Tutorials not only take you out of the game, they slow everything down right at the beginning of the adventure. That's like if Indiana Jones was running from the boulder and the movie paused to ask if everyone was comfortable. Although they serve a purpose, especially now when gamers aren't expected to read any sort of manual, tutorials tear gamers out of their world and remind them that they're playing an artificial experience developed by people who have to assume they've never held a controller before.