Queens Gambit Acceoted

good for white, trashy for black

A solid, sound defence that usually leads to open piece play. (Which is good if you don't like closed, positional games.) However it frequently generates endgames with symmetrical pawn structures, making it difficult for either side to win.

According to James Rizzitano:  The QGA is a suitable opening for all players, not just World Champions and world class grandmasters - one of the advantages for the club and tournament competitor is that the characteristic positions can be understood by players of varying ability. Black's opening strategy conforms to classical development principles because he fights for his share of the centre and he can usually develop his pieces quickly and safeguard his king. Black usually does not have to worry about being overrun by a central pawn steamroller, he does not have to struggle with a bad bishop, and he does not have to embark on any complicated knight tours to complete his development.

Savagechess: people like Peter Svidler, Fabiano Caruana and Sergei Rubelevsky all almost double your rating do not agree and all play it often

The queensgambit accepted is a perfectly fine opening. It is relatively good to learn since the variations are limited. If white wants he can kill the game with a very boring equal variation but that is true in most black mainsteam openings (exchange slav or dxe5 in kingsindian anyone). If white plays the mainlines you get fairly unbalanced positions (depending on what you play with black) where both players can win

It is in my opinion a perfect backup opening if you smell prep

I even prefer 2...Nf6 to Accepted. ( btw, play c6 to cxd5 or lose )

It is totally fine to play but with correct play white will get an advantage.

There is a lot of theory, dynamic and unbalanced positions, and open play that can come out of the QGA. It is very different from the majority of the positions that come from the Queen's Gambit, but I think that it requires you to know your stuff as black. White can be put on the back foot in some lines, especially if they aren't familiar with the QGA. My main impression though is that at lower levels, Black has to know more to.be better.

But make sure you like playing the Exchange Slav ..... A LOT!

...which can be said about 80% of openings since white has the advantage of the 1st move.

The "main line" structures were always too drawish and symmetrical for me. However, there are plenty of ways to avoid those lines and keep the game interesting, and the theory compact. For example:

1. d4 d5 2. c4 dxc4 3. e4 Nc6

1. d4 d5 2. c4 dxc4 3. e3 e5

1. d4 d5 2. c3 dxc4 3. Nf3 Nf6 4. e3 Bg5

If you prefer active piece play against an opposing pawn center, or just good old-fashioned open games, the QGA is a good choice. It also has the upside of being "sound," which is more than I can say for the rest of my repertoire.

Would recommend "Understanding the Queen's Gambit Accepted" by Delchev and Semkov.

EDIT: Just noticed the thread necro