None of the issues you mentioned having have ever bothered me in all my years spent on/with Steam.
With new titles (or GOTY releases), I really no longer care about what platform they're on. My list of preferences starts with DRM-free, so GOG (non-Galaxy) is easily my number one for a majority of releases, as I can just grab the installer and put it on the server, where I can download it whenever I switch machines or finish building a new gaming rig. Right now, I got this wonderful double GTX 690 project going, it's insane.
Sure, installing Steam and logging in is fine most of the time, but I really like having the install package around. It's how I handle OS deployment and I just think it makes sense for games... especially now that intellectual property rights started to get shuffled around with original titles getting altered, if not defaced (thinking of Baldur's Gate right now, it's a shit show).
Greenlight will get changed if I recall correctly, I never really bothered with it. Trust no one is my stance there and I've only ever bought into titles I was pretty certain I'd be able to enjoy as-is, with no great expectations whatsoever. Darkest Dungeon I enjoyed greatly before its final release, and I must admit that I've only played it like five minutes after that release. And that's the only Early Access title I've played on both sides of that final form official release.
My experience with Valve support was always quite stellar, really. Just yesterday, I got served an ad for Kingpin: Life of Crime on Steam. I paid ten bucks, installed away, downloaded all the patches and fixes I could grab and... they stripped the Cypress Hill soundtrack out of it. No warning, nothing. I played for a minute or so only, so I wasn't even allowed to write a review warning others about this. I got my money back within 7 minutes of the initial transaction.
Paid mods are a sign of the times and they'll quite probably be coming back again and again until they stick. As long as I am not forced into buying them, they don't bother me in the least. Look at how much digital-only content all the publishers meanwhile stick into pre-order bonuses or "season passes" that look more and more like subscriptions to core games that gets sleeker and slimmer every year.
I played the original Counterstrike, CS:GO does not interest me in the least. Tmartn and folks are easily deplorable, but so is the whole concept of paid loot crates and boxes. I don't like it, so I don't get involved there. But I do notice that these business models, revenue streams and secondary markets seem to spread like cancer. What does that do to me? It makes appreciating old Super Nintendo and Sega Megadrive games so much more compelling and enjoyable to me, that's what it does.
I've tried out Ubisoft's or fecking EA's alternatives, and there's just no competition there. GOG and DRM-free for me any day, every day. When I die, my digital-only accumulated collections will die with me. It's the plastic boxes, the floppy disks, the CD- and DVD-ROMs and the BluRays that will get rediscovered or sold back into circulation.