Per the current amp/pedal/Darkglass/whatever conversation, here's my take.
I used to have a good deal of boutique gear. I'd estimate about half of my sizable (15ish pedals at any given point) were boutique, especially the dirt section. In the past two years, however, I've greatly downsized those pedals and have found mass-produced alternatives that are cheaper and sound better to me. Here are some specific examples:
The DG B3K is my longest-serving pedal to date, serving me nearly a decade on my board. About a year ago, I removed it from the board. I found I preferred the Ibanez PD7 for those same tones (thrash/death metal) because it kept my low end cleaner and was easier to dial in. I had 3 B3Ks at one point, but they're all gone now. For the price of one used B3K, I bought my two PD7s, with a little change. I prefer that tone. I also tried the mother of all B3Ks, the B7KU. It was the quickest flip I've ever had. Couldn't stand the high end fizz, and I couldn't dial it out. It was gone within a week.
In regards to doomy tones, I also briefly tried the DG VMT for "tube dirt". I found it pretty good, and didn't have any sort of specific gripe with it that I can remember, but it didn't beat out my Way Huge Pork Loin (modded ala JohnK). So depending if you consider a single cap swap "boutique", this may or may not apply. Regardless, the Pork Loin is the absolute best distortion pedal I've ever had. It simply works in pretty much any situation. It's my desert island dirt.
Doom fuzz tones, I have yet to find anything better than my Pharaoh Supreme, though it is incredibly close between that and my Swollen Pickle. I could be totally happy with my Swollen Pickle, but seeing as I have two boards, have decided to keep both fuzzes. They are both finicky, and require lots of tweaking, but I feel that I could get any fuzz tone I need from either given enough time.
My HM-2 is still boutique - Dunwich DIY HM-2. I'd love another! The runner up for that however, is mass-produced. Arion Metal Master. Definitely different, but it's the best bass HM-2 on a budget, and does beat out my Throat Locust on bass as well for straight up HM-2. It's not versatile, so if you want something in the HM-2 family but different, I'd go for the Throat Locust, but I digress.
My bass/amps aren't boutique either, if that matters. Typically, standard Ibanez Soundgear basses (though I plan on upgrading the pickups/pre on one that has a persistent hum) and GK amps and cabs. Nothing "cheap", but solid. I did try the DG MT900 in a store once. While I liked it, and it sounded good, it didn't do anything I couldn't do with my pedals. I found that I preferred the GK. The DG amp was great for DG tones, but I had to use the EQ to shape the onboard dirt, and then my other dirt didn't sound right (I had brought some of my pedals to test out the head). If you only need that dirt tone, it would be a great amp. I like numerous tones.
I feel that with all of my gear, I can play any genre. Well, I have the effects to play any genre... Skill is something else entirely.