People tend to overdramatise quite a bit when it comes to SVO - it's not exactly Baghdad International

The lounges are not that great but if all you need is a quiet place to do some reading and have a bit to eat, any of them'll do. You may try to get in using your DL Gold card (the lounge dragons just might not know DL Golds are not Elite+) or, if you have a Citibank gold card, at least one of the lounges should let you in.

If you can't get into a lounge, go to the shops. The Grand Tour of SVO2 shouldn't take more than an hour as the terminal is very compact. Then retire upstairs where all the restaurants and bars are. I believe all of them are pretty much the same so just pick one that looks half decent and camp there for the duration. Note that you can actually look down from the cafés to the gate area so you may want to choose one above your gate to be able to keep an eye on what's going on (last-minute gate changes are not unheard of). Just wait it out upstairs and don't go below until, say, 10 minutes before boarding starts - by then they'll have started letting all the remaining passengers jump the line to the final security check (each one serves two or three gates).

Hope it helps