Just to show the statistics here is the RA2 ladder page:
http://xwis.net/ra2/
and the Yuri's Revenge ladder page:
http://xwis.net/yr/
As you can see it is exceptionally rare for anyone to play any Soviet faction other then Iraq in competitive games. Naturally Yuri's faction is also high on the list (in-spite of all the "no Yuri" rules in games). America appears somewhat high also (for early Paradrop rush tactics). Here is a breakdown for this month's top player country picks:
Red Alert 2-
Iraq: 481
America: 161
Russia: 2
France: 2
Korea: 1
Libya: 0
Cuba: 0
Germany: 0
Britian: 0
Yuri's Revenge-
Iraq: 160
Yuri: 79
America: 2
France: 1
Germany: 1
Libya: 0
Cuba: 0
Russia: 0
Korea: 0
Britian: 0
Why do you think the top players like to pick Iraq so much? They only have one unit the other Soviet factions don't have.