No one underestimates his game on this "grass" which of course on the other hand has played a big part in Roger doing pretty poorly at Wimbledon over the past 10+ years.
the slowing of the court has been greatly exaggerated by people.. The evidence isn't that clear. It's even more exaggerated by those who want to belittle Nadal's game (ah... he's 1 dimensional, only doing well on grass as grass is clay now etc..)
Let' analyze.
Borg did pretty well in the super fast grass didn't he? A baseliner. He dominated for years.. Jimmy Connors did pretty well on grass too.
During 90s, an era people allude to as 'the super fast grass'. base liners weren't exactly struggling on grass. Super grinder Courier made finals, super baseliner Malivai Washington made finals. Agassi won it one year and made finals of another year.
Yes, there were more S&Vers back then but base liners have benefited more from technology. Edberg, Rafter, Becker, Sampras would have a harder time coming to net against today's base liners, no matter how fast surface is. S&V is difficult, requires more skill and harder against returners with better tech...
If Agassi, Malivai Washington, Connors, Borg, Courier could do well on grass, Nadal and Djokovic would be HELL in 80s and 90s, especially with today's tech.
btw, i remember when Hewitt won Wimbledon, against Nalbandian, the experts claimed 'grass has slowed', this was all the way back to 2002!!! All of sudden Federer started winning in 03, and grass was fast again? lol Then, Nadal started doing well, grass slow again.
lastly, Fed was asked about this a few years back and he said grass was still fast, he said the bounce was 'truer' as it's a different grass but that he thought it was still fast... even his fans dismissed Fed's comments as BS as they simply HAVE to find an excuse as to why Nadal can do well... If you notice, Djoker, Nadal, Fed do well on clay and grass cause they are GOATS. Who else? We tend to see a stark difference outside of these 3, with different guys performing differently on clay and grass. These 3 are just good all around so we can't say grass = clay just because these 3 can do well on both. look at the rest...