I like that it feels like an updated 1e to me (because I play 1e), and that it feels like an updated 2e to some (who play 2e), and that it feels like an updated 3e to others (who play 3e), and that it feels like a mish-mash of annoying rules that have blatantly vague descriptions that make the game virtually unplayable (to those who play 4e).
I am a fan of 4e and the old school/1e feel has absolutely zero value to me, despite having played in that era. However, I recently played a game of 5e with 2 guys that have not played D&D before and 3 that have not played since the days of 1e. We had a great time, I think 5e is great entry into the hobby.
The only thing that really stood out as clumsy or confusing to all concerned was where spells had a mixture of rolls to attack, saving throws, automatic effects, effecting a hp amount of creatures. Compared to 4e the resolution of spells, 5e looks like a dog's breakfast in this respect (IMO).
The other thing that the guys picked up on was the effectiveness of the rogue in combat with the sneak attack damage, compared with everyone else. The fighter at the table asked "why are we all here", and the rogue replied, to set up my sneak attack! But overall I think the balance between martials and spell casters worked out well. I played a cleric and he was effective. We had a lot of fun with creative uses of cantrips - but I did not like the cleric being drawn back into the healbot role.
So my likes and dislikes are shaped by gaming preferences but drawn from my actual gaming experience.
Like:
I was really surprised how much I liked being removed from the encounter framework of 4e.
Liked the fragility of the PCs/danger of combat
Cantrips - especially the non combat cantrips really make the casters interesting
Advantage/disadvantage is excellent
Dislike:
Lack of self healing options for non-fighters (also not sure how well the fighters second wind is going to scale)
Cleric dependence for healing - I would have been shot if I used my spell shots on anything other than healing. I really miss the way healing spells and everything else was siloed in 4e.
I still think the 4e system of static defences is more elegant than the 5e mix of attacks, saves and effects.
In sum: i had a great experience playing 5e, but I still have mixed feelings (and some frustrations) about some of the good innovations of 4e being thrown out.