I'm not using names but I have recently seen a certain few players building sentinels then hiding behind boxes etc and idling there for the rest of the game, then idling through the next game and so on.
If I see anyone persistently doing this I will kick you out of the game as its a waste of bandwidth and player slots especially when the server is busy.
If you intend on leaving for any lengthy periods of time then either jump in to spectator mode or disconnect.
This does only apply to lengthy periods of time however as no one is going to kick you off for answering the door / phone, or being dragged into that unwanted and unpleasant conversation with your girlfriend / boyfriend or whatever as that's something we all have to do every now and then, I'm only bothered about the ones who build sentinels then go and hide while they watch television or whatever.
You know who you are and why you do it, so don't be tempted please.
The second issue I would like to bring attention to is abuse of the terrain glitch with the translocator.
The occasional building of a sentinel under a map is ok with me, (even I do it sometimes

By abusing it I mean hiding under the map throughout the entire game and shooting the monsters through the floor, I don't like this.
You will not be kicked off for doing it but don't be surprised if either 50 warlords come out of nowhere and make a P3Y-229 of you and your sentinels, or you and your guardian sentinels are all vaporised in a cataclysmic nuclear holocaust :twisted:
Don't say you weren't warned!
And best of luck to all new comers, have fun!