Dalglish told Scotland on Sunday: "People would probably be surprised at the standard. If you look at most American players that have come over to the UK, most of them have done well, most of them are playing in the (Barclays] Premier League, which is supposedly one of the best leagues on the world.
"That tells you a little bit about the standard of the American players. Celtic went over there and played against an American team and got beaten, Chelsea went over there and got beaten, that shows you what the standard is like. It's a good standard and probably underrated throughout the world."
Former Newcastle striker Dalglish also said: "I never played as much in my second year because I had to have surgery on my ankle, but the first season went brilliantly and the second season started well.
"I didn't play too much after I had the ankle operation but all of it is good memories in America. It's a lot hotter so you have to keep possession a lot more. Teams keep the ball at the back and midfield and when it gets into the final third they increase the pace then, because it's so hot that you can't run around the way we do here for 90 minutes.
"I have learned a different style of football and whether I'm a better player or not, time will tell.
"I'd like to think I am, I'm more experienced, but time will tell."