I can at least confirm that it's fun with the right people.
5e is a playable game, and that's more than I can say about its immediate predecessor. It is missing a lot of the depth of 3.5/Pathfinder, and the player doesn't get to make as many choices. Ability scores are a lot more important, since all d20 rolls seem to be influenced only by your ability score modifier and a meager proficiency bonus. I felt pigeonholed when it came to choosing my race and buying my ability scores; you'll probably spend all your points in your spellcasting ability score, Constitution, and either Dexterity or Strength, depending on what kind of armor you wear. The feats you can choose from are much better than those of 3.x, but you won't get nearly as many - every fourth level, you'll have to make a very difficult decision between +2 to an ability score or gaining a feat.
Spellcasting is different. One change I like is that you can spontaneously cast from the spells you have prepared, instead of memorizing each in a specific slot. Many spells now have a duration of "concentration", meaning that the spell ends if you cast another concentration spell or take damage and fail a Constitution check. One change I really don't like is that spell effects only scale if you cast them in a higher-level slot, instead of doing so automatically; no one who knows what he's doing will ever actually do this.
My favorite thing about 5e is the backgrounds. These help you determine your character's personality, and also what skills your character has. This also means that no one's forced to play a Rogue anymore, since any character can choose the Criminal background and get proficiency with thief skills. Due to the smallness of the proficiency bonus, however, there isn't a huge difference between a character with proficiency and one without it; at level 4, the proficiency bonus only gives you +2 to your rolls, and only gets up to +6 by level cap. I feel like no character will ever be truly great at anything, just moderately better than others.
Overall, my impression of 5e is that it's okay. It takes some steps forward, but for each it takes two steps back. I'd play it if it were the only option, but if given the choice I'd pick 3.5 or Pathfinder.