It was really fun at first. It's a nice catch up mechanic, being able to fly down to exactly where the zerg is - totally fun and at first I though it was great. Now that I've run a few labs with different commanders, I've changed my mind. The problem is that not all players - for whatever reason - have mounts. I've seen lots of people gamely trying to keep up with the zerg but always falling behind and missing most of the mobs/doors. I myself have been caught way behind the zerg because I couldn't get out of combat with the rest of them, and that just becomes a spiral of fail unless there are others in the same boat with you to help clear. The last Lab I joined had a commander that was mount rushing all the doors and ignoring everything in between and leaving people behind in the dust without a care - I didn't stay long in that one. Mount engage abilities are only a slight annoyance, but can still get aggravating. I feel bad for using my mount to my advantage when I see others not able to.
I'm just finding the atmosphere a little more selfish so far. And yes, I know it's not even been 24 hours. I thought about sitting on this a little more until I've lived with it longer, but it got more and more annoying as the day went on. People are figuring out how to use the mounts to their own advantage. This is all separate from the mount race in the Lab (which I like and it's fun, but I would give it up in a heartbeat to get mounts out of the maze and achievements). This is an event for core Tyria, it should be equally accessible for all players at the core level. Don't take this as a chance to tell people to buy the upgrades. Maybe they are returning players and just haven't yet, or maybe a new player is still trying to level to 80. Maybe it is a new F2P player and this mount stampede is the impression they are getting of the game. Why they don't have a mount is not the point at all - the point is that we're not all on a level playing field for a core festival event that is accessible from level 1.
So that's where I sit on the issue. I'm sure that there are going to be many, many people who love it to death, so tell me why. What do mounts being enabled in the maze add to the experience?