Well I'm afraid it seems like I'm going to be the odd one out here. I don't like 8th edition at all.
I've talked about the subject in detail elsewhere, and I don't really feel like repeating myself, since I'm largely tired of the whole matter. What I will say is this: that regardless of any objective strengths 8th may have, I just don't find it fun.
I've actually given it a few tries now, mostly because a few friends have gotten into it (and I'm prepared to make an exception for them, since I value their friendship more than semantics over rule sets, provided that I don't have to spend money on 8th edition rules as I'm trying to vote with my wallet and therefore don't want to give any direct support to GW for 8th edition). But every time I do I don't find 8th edition enjoyable - I have fun despite the 8th edition rules, not because of them. It is telling that I have not brought my fledgling Tau army into a GW store or FLGS since 8th edition was released.
Ultimately I'm a child of 3rd edition, and that style of 40k is what I like best. 2nd edition and Rouge Trader are ultimately ancient history to me, so any throwbacks to them are of little value to me, and besides if I wanted a 2nd edition style experience I would buy a copy of the 2nd edition core rules and play 2nd edition.
I've also gone on at length on numerous other occasions about my thoughts about the new background material and aesthetic directions, so will not be repeating myself here. Suffice to say that my hatred for overt central metaplots and my disdain for the increasingly Blizzard-esque design direction GW is adopting should by now be well-known to many.
It is an interesting point raised by the last couple of posters regarding the community element. My own experience has been exactly the opposite to theirs - the recent trends in GW and the community have left me feeling less included, not more. Because I have no interest in 8th edition and still love the early 2000s 'Silver Age' era of GW, I feel increasingly ostracised and alienated by GW and the community, and my enthusiasm for 40k is at a record low (no doubt a major contributing factor to the resent epidemic of Painter's Block I've experienced over the last couple of months). I think I must be the only 40k player in the universe who does not
want to see Chapter Tactics style special rules for every faction, and indeed their proliferation is a major factor AGAINST 8th edition for me.
Still, I'm largely trying to move on and peacefully co-exist with the 8th editionists. 3.5, early 4th and 6th edition are what I'm happiest with, so they're the rules that I'm using for 40k. I learnt long ago with Battlefleet Gothic and Warhammer Fantasy that I don't need the studio's blessing to enjoy a set of tabletop wargame rules. Indeed, while 8th edition and the modern 'NuGW' material does nothing for me, I still feel happy and excited and enthusiastic for 40k and tabletop games when I read through old GW publications from the early 2000s. What's more, the increasing dissatisfaction I have with GW's rules has led me to look further into the dark art of homebrew content and creating my own rules material, something that I've discovered I really enjoy.
So it's fine if you enjoy 8th edition, but it's not for me. I'll be over here with my 4th, 3.5 and 6th edition rules working on new content for them if you want me.