To be honest I do not understand most of this D&D5 critics. Sure, it's not a perfect system (I prefer, for example, Warhammer) but it's functional and definitely better than D&D3. Ye, I have changed my mind – a few months ago I had other opinion.
I also do not understand all those considerations about fighting. Typically during 10-12 hour PnP meeting we have 3 fights max (something at the very start, something in the middle to make a break from RP, and a boss fight in the end; the latter can usually be resolved by means other than combat; most of the meeting is RP and problem solving, it’s RPG, not a board game). So it is not as important part.
As a DM I have introduced a bunch of house-rules, but far less than in D&D3. I changed same spells: no resurrections, nerfed status-effect-removals (because disease should be a serious and long-lasting problem, not something to cure with 2 level spell), some spell descriptions from AD&D2 (for example Insect Plague in D&D5 is boring damage-dealing spell without additional effects). I have weakened the resting rules (in general players only receive 1/2 or 1/3 of HP in comparison to official ruleset + resting is impossible in many situations; for example in wilderness you have to find a shelter, a water etc. so survival skills are important – as well as surgery skills). I have introduced wounding rules (less than 50% HP and you starting to get some serious penalties to stats + you are risking an injury like broken leg, severed hand etc.). And that’s it. It's one page of house rules to make the system functional. In a comparison: I need a 20 pages long manual of house-rules to make D&D3 barrable.
And ye, I do not like high level adventures anyway. Most of my campaigns are in 4-13 level range. Above it everything starts to look stupid.
I also do not care about quality of any extra materials. For now I’m using Players Handbook and Monsters Manual from D&D5 + Campaign Setting from AD&D2 ant that’s it, I have no need nor will to buy anything else. From the very beginnings of my RPG adventures I was convinced that D&D was one big fraud and theft, aimed at unimaginative suckers. What’s the reason to buy all those shitty books? In case of all my favorite RPG systems (Warhammer 1. ed., Monastyr, Neuroshima) you really need only one books, containing everything: ruleset, spell book, bestiary, some advices for DM, a brief description of the world. It’s enough, really. After all RPGs are games about imagination. As a DM, I prefer to fill the gaps and blank spaces with my own ideas, rather than look for answers in 100 books. I do not need 50 pages of battle maneuvers and modifiers because it’s no time for all those mathematics in a heat of battle. I do not need a separate manual about every country in the world; one paragraph of a general description is all I need.