It is hard to evaluate things like camera performance, battery life and overall responsiveness by being in a store for an hour or two.
I'd rather ask about from people who had it for at least a few days.
I am highly interested in note 4, but I can't afford it to buy it outright, nor do I want to get a repayment plan for the phone, because that would raise my overall payments each month. However, I can sell my own phone and add a a 300 bucks or so and get something for about 450. I think LG G3 can be bought for that, but I hear things about Nexus X coming out soon, so I may wait for that. I should wait for reviews of nexus 6 and learn more about the camera performance and other evaluations.
Take the posts that say "alot" "most" or "many phones have problems" with a bucket of salt.