The Pearl is NCL's newest ship, which usually attracts NCL's best crew members. It's also is the only NCL ship with Glacier Bay on it's Alaskan itineraries.
You made a wise choice, as it offers the best cruising experience NCL has. I'm not suggesting the other choices NCL has for Alaska are bad.
I agree with Berick, how successful your cruise is really depends upon you. Go with a bad attitude, you'll have a bad cruise.
If you check out the reviews, especially the bad ones carefully, you'll usually see one bad experience overblown way out of proportion, so much that it affected their vacation.
Also, many of the bad reviews are for ships sailing around Hawaii with relative inexperienced American crews. Here's the best news, the Pearl is manned with an experienced International crew.