Yes, there are a lot of bugs in the game. There was likely not enough testing before the release, especially not under such load like now.
I will make a list of the most known issues and possible solutions here, for a temporary workaround until the issues get patched:
1.Servers:
There are no official servers yet and people have to host their own games. This can lead to bad performance or connection interrupts.
If you host a game make sure your PC is fast enough and you have enough bandwidth for upload, you will need around 8 kb/s per player on your server.
2.Server settings:
There seems to be a problem in the server settings in where the player limit does not work, so too many players join games, which leads to lags and later server crash and maybe bad gameplay experience.
You also should activate "Allow Cycling" in options, otherwise the server will shut down after a match and all players will return to menu.
So for now don't overpopulate the servers
3.General
Read the manual you get when pressing "Help" on main menu or "F1", there are some hints.
You should play on servers with latency/ping below 150, better 100 or less, otherwise the game will not be playable and you have significant delay.
4.Controls
Many experience mouse sensitivity problems, make sure you set the sensitivity in options before playing, you can also change some options while in a game.
5.Dedicated servers
If you want to host a dedicated server you can do this with following command:
Uebergame-Win-64-Bit.exe -dedicated -mission ./levels/Training_Grounds/TG_BuildingSite/TG_BuildingSite_day.mis
Where the binary can be replaced, if you want to try Linux for example, or the level, if you want to start with another level also make sure "Allow Cycling" is on in options. This is the commandline version, if you have a shortcut on your desktop, you can add the parameters -dedicated... as launch options.