Most Annoying thing with steam?

Stopping downloading when playing games. I do have to Alt+Tab to conitune it which SUCKS

Oh yeah, the most annoying of annoying. Is when you don't update your game, steam automatically updates it at startup FFFFFFFFFFFFUUUUUUUUUUUUUU

Having to install Microsoft C++ so many times, i must have like 5 different versions of 2008 installed

There's a lot but after 10 minutes with Origin, I thought Steam was the best thing ever invented.

That when you have opened dunno... for example forum post, than you close (pressin' that "X" - not completely closin) the steam -> open it... AND THAT STUPID STORE AGAIN!!!

1. Inability to disable Group announcements.
2. Allowing groups to triple announce.

I really hate two separate windows - one for steam client and one for friend list.

steam guard.

I guess the system where it doesn't download game when you play a game from Steam library. For example, I wanted to play some Binding of Isaac while I had Portal 2 downloading and installing and I completely forgot about this "stop download while playing" thing. I played for an hour, looked in Steam and was very angry because Portal 2 had only about 5% downloaded instead of about 85-90% that it should've been.

i know this is a dont like but i have a like thing: if you go ingame do shift + tab (default) click add friends go to another site (porn) it doesnt show up in your internet browser history (tips for kids!)

russians group invites

Russian Group invites and there is no multible tabs for web pages in the client.

I'm amazed that no one mentioned steam eating all bandwidth when its downloading.

The fact that I HAVE TO run it while playing a game, or at least starting it. When you have a not high-end computer like mine, any extra tasks while you're playing a game make it lag more.

The (lack of) privacy settings.

-lack of download scheduling

-client is extremely slow

-support is generally good at solving the problem (in my experience), but they just take ages to respond.

The DRM.

My inability to delete non-steam shortcuts from my library...

Those little fuckers keep coming back whenever I restart steam.

steamguard.

how am i suppose to hack people with that thing on?

Regularly re-downloading entire games for no apparent reason, unnecessarily chewing up my limited monthly download allowance.

The most annoying thing is the lack of a Summer Sale right now.

Official steam tiles for windows 8, i use third party app for that right now cause those tiles are just gorgeous, but why steam can't have that by default? Instead of adding ugly desktop icons in metro interface...

Aswell would like to see steam cloud support for more games and better steam browser aswell, cause current one is way too limited.

annoying thing for me is that i can't find out what files are steam downloading on my pc ^^

The thing I find most annoying is that there is no way to find out if a game supports a windowed mode until you actually play the game or if the game is going to have one choice of resolution that is too big for your monitor. I do think that should be mentioned in the features or requirements. That and most games lack any sort of ability to disable fullscreen until you get into the game, and that has rendered a few games unplayable for me.

I'd also add, no way to message someone who is not on your friends list. Obviously if allowed it should be able to be disabled and/or you can have a block list if you get a lot of spam. Not so bad once I figured out how to turn off the alerts that a friend was playing a game, but still obnoxious.

Inability to play two games at once. Like right now the game I'm playing is just auto grinding towards an achievement. I'd like to play something else.

Not being able to opt out of free weekend games. I don't want them added to my library for any amount of time.

My number 1 peeve is those annoying alerts that keep popping up. If only you could filter which types of alerts are displayed. After that:

Forced updates
Downloads pause when you start a game
Bizarre implementation of window modality
That "Steam needs to convert the game data to a more efficient format" thing which completely locks up absolutely everything for a good part of an hour or however long it takes with no way to cancel, so if you give up and decide to play some other Steam game instead you're forced to kill Steam through the task manager
Offline mode still seldom works
UI problems - general sluggishness (worse than any other program I've used), no support for the context menu button, almost nothing accessible from keyboard
Can't install a game without Internet even if you have all the files and it's right there on your library in offline mode
No option to "appear offline" in Friends