Nobody said that in the old days everyone was great (at least not me), but it was definitely different. With the way recording technology has evolved and the way brutal "singing" has been popularized the last 5-10 years (so everyone can take the easy road), everybody and their grandmother can put out an album. Waaaaaay more trash to wade through if you want to find something decent.
I'm gonna whine again about the singing thing and I'm gonna sound like an old fart (which at 35 I guess I might be) but I can't even count the times where I started listening to a new band and I say "hey, this music is not bad at all!", and then the singer starts screaming like a retard and I close/turn off/delete it on the spot. This definitely wasn't true when I was younger. If you wanted to play power metal or progressive or whatever melodic metal you were supposed to find a singer. Somewhere along the line (with bands like children of bodom getting popular) it became ok to just get your best buddy, who can growl enough without getting a sore throat, as a frontman, which saved you from the trouble of finding an actual singer and, even better, from having to actually write vocal melodies. So, naturally, everyone jumped on that wagon.
I know what you're saying but I think this is a very narrow view of the metal world. If you're really into power-metal and that sort of stuff (which you obviously are) then you need to be able to sing really well. Still, there are good and bad singers, just like there are people who can growl really well or some who suck at it.
Some of the most recognised metal singers in history aren't very good singers at all, but they've still made some incredible music. Lemmy, Ozzy Osbourne, James Hetfield, Dave Mustaine, Phil Anselmo (in the later years), etc.
We should always remind ourselves that being a very good growling/screaming vocalist can still take a lot of practise and understanding of musical concepts like dynamics and rhythm, just like being a clean singing vocalist. Many of these vocalists write incredible lyrics as well. I mean, who has more talent? A singer like Johnny from JFAC, Mikael from Opeth/Bloodbath, or someone on the radio like Kanye West?
Some singers can do both exceptionally well, too. Mikael from Opeth is a perfect example.
There is plenty of boring music with growls out there, just like there is plenty of boring music with clean singing vocalists, or even more generic - the thrashy style vocalist with bands who want it to be 1986 again.
I guess I sometimes feel sorry for people when they say they can't stand growls. I don't mean to make fun of them or pity them, but I feel bad that they are missing out on some incredible music.
For what it's worth, I love metal with all kinds of vocals, and I like Psycrence very much.