As others have said, avoid due to the servers being taken offline and the dwindling playerbase, not to mention numerous issues with the F2P model, DLC and apparently card drops too. The devs are lacking in the moolah department, so this is pretty much abandonware at this point.
As for the game itself, it's a weird one - there's a decent title struggling within a cocoon of poor execution that isn't allowing it to spread it's wings. The premise is solid, the humour is pretty good and with good netcoding, a thriving playerbase and a fair few tweaks around the game, this could've been much better than it is.
Sadly, Dungeonland is a prime example of a game that illustrates the pitfalls of lazy developer updates and shocking connectivity (in a game that advertises itself as a multiplayer experience, no less). If you've got a few buddies who're up for some local play, then it could be worth a spin. Otherwise, keep your barge poles at the ready.