Kieran said:
Stan is much more effective as a sniper than a front runner. He gets great kudos for his remarkable victories, and never really catches much flak for his absences in big matches.
An interesting view; I hadn't thought of it that way, but I think it could hold water. If true, the reason could be that Stan has such an unusual career in that if you take away his three best tournaments, or even just his three best matches, he goes from being a three-Slam winner to a career similar to a second tier player like Tomas Berdych's. Consider:
STAN: 3 Slams, 1 Masters, 3 ATP 500s, 8 ATP 250s
TOMAS: 0 Slams, 1 Masters, 3 ATP 500s, 9 ATP 250s
Now of course you could argue that, duh, you can't take away Stan's Slams, so the comparison is meaningless. But compare, for instance, Andy:
ANDY: 3 Slams, 14 Masters, 2 Olympic Golds, 8 ATP 500s, 16 ATP 250s
Andy's title count, aside from same number of Slams, is vastly better than Stan's. And of course he's not a great comparison because Andy has the overall resume closer to a 6-Slam winner like Edberg or Becker. But look at other recent 2-3 Slam winners:
KUERTEN: 3 Slams, 1 YEC, 5 Masters, 3 ATP 500, 7 ATP 250
HEWITT: 2 Slams, 2 YEC, 2 Masters, 2 ATP 500, 22 ATP 250
SAFIN: 2 Slams, 5 Masters, 1 ATP 500, 7 ATP 500
RAFTER: 2 Slams, 2 Masters, 1 ATP 500, 6 ATP 250
As you can see, Kuerten, Hewitt, and even Safin all have fuller non-Slam resumes; Rafter is close, with that extra Masters but fewer lower level titles. And of course Stan isn't done: maybe he wins a couple more Masters and ATP 500s to flesh things out.
But here's the point: Stan became an elite player at age 28, which is unheard of. Before that he wasn't even Tomas Berdych, he was closer to John Isner or Nicolas Almagro...and maybe not even quite that. But things started coming together for him around age 27-28 (2013) and he went from being a top 20ish guy to a top 10 guy; but then in 2014, he jumped even higher and won his first Slam just before turning 29 years old. Since then--a span of three years and 12 Slams--he's won more Slams than anyone on tour except for Novak Djokovic.
This is my long-winded way of saying that I think the reason Stan doesn't get flak for losing big matches, is because his success was so unexpected and unusual. It isn't unheard of for players to have peak years in their late 20s or jump a notch later in their career; David Ferrer is a case in point. But it is completely unique to go from being a perennial #20ish ranked player (what I call 3rd tier) to #10ish (2nd tier) at age 28 AND #5ish and a multi-Slam winner (1st tier) after that.
To put all of this another way, Stan started winning Slams at an older age than the LAST Slams won by Becker, Edberg, Wilander, McEnroe, and Borg. He is truly one of a kind and, through his uniqueness, has somehow evaded the usual criticisms that top players face.