Doesn't seem so to me, I have an pretty good player, rally skills all over 90%, mental and physical high too, I have also high return skill. And still, IRL doubles specialists (Bryan brothers, Knowles, Nestor) manage to beat me in the singles. I also see them reach some crazy rounds in tournaments, like a QF in Wimbledon singles, that is IMHO impossible. And they also defeat some other good players, not only me.
Also, when I want to play doubles in Davis cup, before it a message pops up, saying that mine and mine's doubles partner doubles ranking is not high enough and this tournament does not have an qualyfing draw, even though he is not from the same country as I am. This should not pop-up, only if your DC captain choosed you to play or not.

I'll probably come with more matters later...