The Proving Grounds are a one-person instance in WoW where you can practice tanking, healing, or dps roles with and against mobs that are a bit more interactive than training dummies. There are some NPCs that will help you, and the various mobs have different abilities and/or need to be attached from different directions.
So far, so good, it’s a neat concept. I have friends and guildies who love the Proving Ground mini game; it has harder and harder modes and you can keep going until you get to Infinite Mode which means carry on until you are bored or wipe. The idea also is that it is a good way to practice the roles before trying group content. So in the next expansion, you will have to complete the Proving Ground for your role at Silver level (Bronze is the easiest, Silver next step up) before you will be able to queue for heroic instances.
If there is an issue with the Proving Grounds though, it is this. Bronze level is easy and still does the job of making you use different tactics for different mobs. The more difficult tiers I find tuned harder (or at least different) than what you generally will be asked to do do in instances; harder in the sense of no one to help, and hard timers (i.e. count down in the corner). So Silver Mode in WoD could actually be harder in some senses than the content it will be used to gate, and still not guarantee that people who pass it will be useful in heroic groups.
Also when the game does this in single player mode, it penalises some classes/ specs more than others because the encounters are tuned by role, not by class or spec. For example, if I’m doing a tanking Proving Ground on my warrior, my dps will be less than that of the other tanks because of class choice. It doesn’t make it impossible (they do tune it reasonably from that point of view), but it will be harder for me to make the timers, even if my tanking is otherwise flawless.
It’s not necessarily bad for the players if the gatekeeping requires a higher skill level than the instances. It implies at least that the people you will be queuing with will be good enough to manage the heroic. But if the gatekeeping keeps out too many people who would have been fine in the groups but are no longer allowed to queue then a) people will leave the game and b) queue length will increase. It’s a fine line. My confidence in my WoW skills is very low at the moment, so I’m assuming I probably won’t be able to do it. Still, there’s always pet battles.
The thing that annoys me most about Proving Grounds is that in the tanking one, you get an NPC healer who also nukes mobs. You have to tab around to find out which one they are nuking so that you can make sure to hold aggro on it. In a just universe, you’d be able to mark the mobs so that you can control which order the healer kills them in – IMO that would be a far more useful thing to learn before queuing for instances than whether or not you can kill illusionary mobs in under 10s.
It does make me wonder about how else you could train players to be more skilled and confident in group roles.