Many are unhappy with New Horizons because we expect it to be better than, if not at least on par with New Leaf. Better meaning more cool features, more choices, more fun.
Yes, many new stuff are added in New Horizons BUT at the same time they removed many of the things that made New Leaf so addictive and popular. Nintendo should have improved on what people like in New Leaf and bring them over to New Horizons. Many npcs and their houses are gone in NH. Even for our own home, those themed external structures like modern, fairy tale, asian, etc. all gone. We used to be able to build up to 4 character houses, each with a different theme. And I supposed we can't swim in New Horizons? We are living on an island surrounded by water and we can't swim?
And, I personally feel that there is too much crafting in New Horizons. It is fun when you do it for the first few days or even weeks. But if you have to craft almost every single item, including those special event items, it becomes a chore. This game already has so much things to do if you know what you want, but having to find recipes and hunt for materials to craft 90% of the cool stuff you want is really tedious and bored in the long run.
I read many said those features missing could be added in future updates. But how often do the updates come? So while waiting for the updates, we can continue to do the tedious chores and play the waiting game the way Nintendo wanted us to play. And besides, they are just speculations, nothing official. With all these grunts, yes I am unhappy and disappointed with New Horizons. But this doesn't mean i don't like this game. I will wait a little while longer before I decide if it's worthy to spent around $300 (Switch Lite + Game + Subscription) for a game I might find it a chore to keep up and stop playing in 3 months' time.
But that's just me.