What other games could learn from WoW

I sometimes see posts on other blogs by people who have spent significant time playing other games, talking about what WoW could learn from those other games and how taking up those aspects of those games could make WoW better. While they often make good points, I think we need to take some time to consider the opposite; the things WoW does well that other games would do well to imitate. After all, Blizzard did many things right in their design of WoW, things other developers would do well to take note of.

-Streamlining pre-playing processes
Games can throw a lot of obstacles in your way to prevent you from reaching your objective: enemies, puzzles, bosses, or even the level you are playing on, but the game itself should not be an obstacle. WoW has done a great job streamlining the things we need to do before we can play the game so we can spend more time actually playing the game. The dungeon finder is a great example of this. Say what you will about how it promotes trollish behavior and reduces the feeling of companionship among group members, but it definitely streamlined the process of getting a group for an instance run and made it much more convenient.

-Not denying content to less skilled players
Let's get one thing straight before we continue; I am not in favor of not rewarding skilled players for overcoming difficult challenges. What I am in favor of is giving the majority of players access to the fun rewards, and at least a good number of players access to the practical rewards. However, the big thing I am talking about here is content, the meat of the game itself: the sights to see, the things to do, the bosses to fight, etc. Raiding in WoW was once confined to the great minority because of the effort it took, and Blizzard has done a great job of making raiding easier for the more casual players to jump into, allowing more of their playerbase to see the content they make. Normal modes, 10-man raiding, the new emblem system--all of them made it easier for players to see the content, while the inclusion of 25-mans and the addition of hard modes ensured that the more dedicated players wouldn't lack for a challenge to overcome.

Most games do something similar in this regard in the form of difficulties, such as easy, medium, hard, etc., that scale the challenge of the game to the desires of the player, and that's a good thing in my eyes. However, what isn't a good thing in my eyes is when a game saves the best and most fun rewards for the people who beat the game on the highest difficulties, be it a special weapon, an extra level, etc. WoW is good about this in that, though the best gear is only available to the hard-core raiders, gear itself is not difficult to get, and the important things (basic mounts and the like) aren't denied to all but the most dedicated players. The only things that are denied to the less skilled players are better gear (which they don't need, after all) and cool-looking mounts, which are cosmetic, anyways.

-The ability to undo mistakes or misinformed decisions
I'm a bit of a perfectionist, and for that reason, I don't like it when a misinformed decision or flat-out mistake plagues me for the rest of the game. Because of this, when I play expansive and complex RPGs like Oblivion and Fallout 3, I often find myself replaying the first hour or two of the game multiple times because I don't like the way it played out or because I looked up a guide on the game and found out a way to make a certain decision much more intelligently. Perhaps I found out that making a certain choice during a certain quest would have been a better decision in the long run, or perhaps I chose a sub-optimal way to design my character. Either way, I often find myself restarting the game simply because I don't want one bad choice to hinder my future chances of success.

One of the great things about WoW is that that problem is not present. Make a bad talent choice? Pay gold to reset your talent points. Didn't like the pet you trained? Train another. Pick the wrong quest reward? You'll replace it soon anyways. Pick the Oracles but like the Frenzyheart more now? Do the quest to switch over. Pick the DPS Ashen Verdict ring but want the tank one now? Do the quest to switch it. Don't like the race you picked? Pay to change it. Don't like the faction you picked? Pay to change that. There are very few decisions in this game that will permanently hinder you for the rest of your time with that character, and the few there are can usually be undone with a ticket to a GM. I wish other games would take WoW's example on this, because it's one of the things I love the most about WoW.

So what about you, dear readers? What aspects of WoW do you like that you wish other games would adopt? Failing that, what mistakes has Blizzard made that you hope other developers can avoid?