https://www.si.com/nfl/2015/10/01/nfl-stadium-turf-grass-rankings The above article is from 2015 after we'd made switch to hybrid surface. Nerd said we used to have the best surface but no more and that guys are always slipping and there's a lot of hamstrings being pulled due to it.
Lambeau Field was the 9th rated playing surface in 2015. Not a single mention of slippage being a problem or hamstring injuries. If there was a big issue with either at the very least the surface would be much lower in the field surface rankings.
9. Green Bay Packers: Lambeau Field, Green Bay, Wis.
Now the only stadium in the league to use the Desso GrassMaster system (which Denver gave up in their field renovation this year) that weaves artificial turf into a predominantly natural-grass surface, this hybrid has proven to work in Green Bay, giving the cold-weather climate an added boost and strength during the winter. The Packers are also the first team to install a heating system under the field (it's been upgraded since the original installment), which keeps the field from ever really turning into the Frozen Tundra.
----Further, back in 2011, field surfaces were ranked. We were not the top grass field.
http://www.nfl.com/superbowl/story/09000d5d81e1a8d0/article/player-survey-reveals-arizona-indy-have-best-fields-in-nfl Finally, back in 2010/11, the NFLPA did a survey on best playing surfaces. For grass fields, Lambeau finished 5th.
http://sturf.lib.msu.edu/article/2011apr28.pdf Again, nerd just throws really bad info out there as if it was factual. It never is.
Ted Thompson sits on his hands per former GM: "because they’ve had 25 fricking years of great quarterbacks. Of course it works. Try it without a special quarterback."