I think you have to distinguish between pure hair metal bands and bands that adopted some of the stylings of hair metal bands because that was the era.
Pure hair metal bands: Poison, Europe, Slaughter, Stryper, Danger Danger, White Lion
Bands that adopted the style: Bon Jovi, Kiss, Def Leppard, Winger, Whitesnake.
The bands that were purely of the hair metal craze didn’t really have anything going on but the image and some good hooks, while the bands that were around before and temporarily adopted the style, or bands that came in late and were shoehorned into the genre by record companies or poor judgment tend to have a lot of non-hair metal worthwhile material to listen to.
I’m a big fan of the genre so every band should be judged on their own merits, but one point I think has to be made is that any genre that is supported primarily by commercial concerns rather than artistic is going to end up as a punchline sooner or later. Almost all of these hair metal bands consisted of great musicians and songwriters who lived in an era when selling millions of records and doing stadium tours if you came up with the right formula was a very real possibility, whereas just making an honest, workmanlike rock record may have gotten you critical acclaim but not much else. So they bought their aerosol and sang about girls and cars. Once the audience for that dried up, they either did one of three things:
- They broke up, went home, and enjoyed their money
- They tried to appeal to the new market by making shitty alternative records. As if anyone would care about a Dokken alternative record.
- They found a more honest sound rather than trying to keep up with trends and either no one cared or they revitalized their career(Bon Jovi). Later on many would go back to their classic sounds albeit with less of the 80s ridiculousness and enjoy some success, but at lest through the 90s few thought of that.
On the bright side, there was tons of innovation in guitar soloing since everyone was trying to top each other. I don’t think there’s been a new idea in guitar playing since 1991 when Steve Vai’s Passion and Warfare came out, so the era isn’t without artistic merit.
And one more thing: hair metal doesn’t hold up well because it was slickly produced commercial music that didn’t really come naturally to very many of these guys. Most of those guys were into the bluesy stuff, the Beatles, real heavy metal, or early 80s glam. In 2015, there are a lot of bands playing 80s-style hair metal, complete with the image, and guess what? It rules, because it’s real stuff to them. They are writing and playing the music they love and won’t make a cent off it and they don’t care.