I've been looking for this thread to pop up and somehow never saw it.
Monster Hunter is my all-time favorite game series. Been playing since MH1 on PS2. I loved 3U but I think this one is the best of the series so far. The new weapon combos they have added for each weapon have made them so fun to re-learn. This has always been a pretty niche series because its very eastern-oriented with the grinding game play, has little in the way of explanation for most of the game mechanics, and can be extremely punishing in difficulty, but man do I love it. I've got it at release and have been working my way through the caravan quests. Just took down Gore Magala for the 5* Urgent.
I've been reading that people consider it the easiest one yet to get into, so thats good. It seems to be selling like gangbusters. Personally I think the monsters are way more aggressive this time around, and the new ones are more difficult than the ones they introduced in 3U. I miss the 3U monsters that are gone though.
If you're trying to find a copy, I have seen them available on Walmart's website. they are out of stock online, but they will tell you which stores have stock available and you can purchase it through the website and have them hold it for you.