A lot of love went into this, and it's absolutely dripping with nostalgia and passion. Seeing every build of every level and practically every easter egg in one package playable on the current version is something I never would have thought to ask for, but utterly adore. And it has its own emblems and secrets too!
That said, however, the SRB2 Museum Zone can cause netplay dropouts due to how long it takes some systems to load. Albeit, this is a problem that could be alleviated on the netcode side if clients/servers can say "hey, I'm taking a long time to load this level, please wait for me!" Even with maxed out jointimeout and nettimeout, it still happens.
Still, though, I've seen (and been the victim of) dropouts because of this. A potential workaround (other than outright avoiding the SRB2 Museum Zone) would be to have a separate, slimmed-down version, but that takes time, and I absolutely don't want to demand such things of you guys (or even just you, glaber?) who put three years into 2.0 alone. Honestly. doing the netplay thing of "wait for everyone to load the level rather than assuming people dropped out" would be best - not just for this, but for the future.