Show whether a map has a game you can join from Tavern

When you click on a map, it should show you:

Joinable Games: 2

This would mean that there are two groups playing this map that need at least one more person and if you joined right now you'd be sent there immediately. I hate being forced to start games on my own as a non-defense build. This is one of the features DD1 sort of had (being able to join games from a list) that DD2 has yet to implement.

That is a pretty good suggestion, it would prove helpful for players whom as you mentioned have non-tower builds and cannot hope to build the map for him/herself.