Anybody?
Orthodox d4
Move ECO Frequency Score AvElo Perf AvYear %Draws
1: Bg5 D50 13223: 45.3% 60.7% 2282 2324 1983 33%
2: cxd5 D35b 8722: 29.8% 65.1% 2337 2388 1998 33%
3: Nf3 D37a 6372: 21.8% 60.7% 2320 2349 1988 33%
4: e3 D35a 463: 1.5% 45.2% 2052 2075 1990 24%
5: Bf4 D35a 234: 0.8% 57.0% 2237 2261 1979 29%
6: g3 D35a 68: 0.2% 58.0% 2163 2224 1989 28%
7: a3 35: 0.1% 44.2% 1933 1994 14%
8: c5 19: 0.0% 28.9% 1998 5%
9: Qc2 15: 0.0% 63.3% 1998 20%
10: f3 6: 0.0% 58.3% 1963 17%
11: [end] D35a 5: 0.0% 50.0% 2004 100%
12: b3 3: 0.0% 0.0% 1996 0%
13: Bd2 2: 0.0% 25.0% 1999 50%
14: e4 2: 0.0% 50.0% 1981 0%
15: h3 2: 0.0% 100.0% 2001 0%
16: Qb3 2: 0.0% 50.0% 2005 0%
17: Qa4+ 1: 0.0% 0.0% 1991 0%
_______________________________________________________________
TOTAL: 29174:100.0% 61.7% 2310 2348 1989 33%

The most dangerous play from black in the orthodox variation of the QGD tends to go as follows:
I created a thread earlier asking for advice on what to do in a roughly similar position to where this ends but it didn't prove particularly useful.
http://www.chess.com/forum/view/chess-openings/the-queens-gambit-orthodox-variation-continuations
Bg5 is generally better than Bf4 for two reasons. Firstly, it offers a threat to win a pawn or give black doubled pawns:
[Out of space so I have to double post and just press solution to see the line. I didn't mean to make it a puzzle.]
Secondly, in the example that I gave first with Bf4 the bishop will end up attacking the empty diagnonal which doesn't have any particular significance in this opening.
I'm technically an expert, but maybe not of the caliber you are looking for. I think the Exchange Variation is great and you should keep playing it. White's positional and tactical ideas are very difficult for Black to meet, and for this reason most top GMs will not play 3...Nf6. What are you having trouble with?
Here are some sample variations.
could someone maybe explain the rationale behind the Bf4 line in the Orthodox QGD? is it just to avoid exchanging the bishop? if so, why is it better to avoid exchanges but not place your pieces as well and allow black to get in his freeing breaks easily than to exchange off your bad bishop for his good one?
On general principles some players don't like exchanging bishops for knights but it's my opinion that both can be strong pieces in this opening. Bf4 also prevents Rb8 but that doesn't seem like anywhere near enough of a reason to actually play it. White's dark squared bishop isn't "bad" in the traditional sense and can actually be useful in applying pressure. Sometimes black will move the knight leading to discovered attacks against it if it is on g5. Again this doesn't seem like a strong enough reason to avoid Bg5.
The exchange variation gives Black long-lasting problems, I would stick with it whenever possible and besides it's Black who often calls the shots in QGD if you don't play the Exchange Var you have to be prepared for Tartakower Variation, Cambridge Springs Defense, Laskers Variation etc
In the QGD Orthodox Defense I believe 5.Bf4 was the "old-fashioned" move that has been pretty much replaced with 5.Bg5 thanks to the great US GM Harry Nelson Pillsbury around the turn of the 20th-Century, although 5.Bf4 has made a few comebacks since Pillsbury's time, but has never regained it's former popularity.
BTW the "Orthodox Defense" was coined by GM Tarrasch as a jibe against the many players who utilized it so "orthodoxly" (ie religously) in the QGD - instead of playing his favorite 3...c5 which now bears his name the Tarrasch Defense.
Anybody some good recommendations for orthodox. I play mainly the exchange variation with white, but would love to find better....