I was a metal head back in the day. I was into stuff that was mainstream, like Crue, Priest, Maiden, Quiet Riot, Def Leppard, Poison, Cinderella, GnR, Skid Row, etc. But there were other bands that you could argue never really got marketed well; Armored Saint, Black N Blue, Badlands, Queensryche, TNT, MainEEAxe, 220 Volt, etc. Marillion was a fantastic prog rock band that never broke the US, but they were (and are) on heavy rotation in my house.
Queensryche was HUGE in the US 1990-1993 Operation LIVE Crime was the tour to see! Funny you mention Black N Blue as their guitarist, James Thayer is currently playing with KISS as the Space Ace character. All the others you mentioned were on the Metal Blade, ATCO or Original Roadrunner (Roadracer) labels and thats why they never was marketed well.
Yes, Im an old metal head myself! 
Fordman
I think it's
Tommy Thayer, unless that was just his stage name, but yeah, I remember he got with Kiss. Didn't he do some producing too? I never followed the labels, but did recently watch that Roadrunner reunion concert. Good stuff.
For Queensryche to be big in 90-93, it took a few years and a few excellent albums; EP, The Warning, Rage For Order. I remember seeing them open for Kiss and another time for Def Leppard. After Mindcrime, they really dropped.
I also remember the first time I saw the video for "Queen Of The Reich". It was the same day I saw "Girls Just Wanna Have Fun". We didn't have cable at the time and I was at my Nana's. I thought they were awesome! And, that was well before 90-93'.
On the marketing end, just a few weeks ago, when lokking for jukebox software and loading album art and such, after adding art for my entire music collection, I actually thought to myself (and sent an email to a friend!) that Queesnsryche has the worst album covers - aside from the Warning. There's nothing about them that makes me want to see what's inside. That's marketing for ya.
An argument could be made for any of these bands as far as how well marketed they were. If Twisted Sister never recorded "We're Not Gonna Take It" along with a funny video, they would've continued to be the butt of every issue of Creem magazine, and I never would have found their earlier, rocking stuff.
You might know this....but there was a local band in the Philadelphia area called Teeze. They had some killer tunes; Party Hardy, Hellraiser, Midnight Madness, etc.. Then, they got a record deal. My understanding is that the name was already being used by some R&B girl group, or something like that. So, they changed their name to Roughhouse. I didn't mind that so much, but then the record label made them change and re-record some of their songs for their debut LP. The changes sucked...and they flopped. That's marketing for you.
Wrathchild's album Stakk Attakk was on HEAVY rotation for one summer. Beginning to end, fun, fun stuff. Still, never made it in the US. Sadly, I never even got a chance to see them.
Another band I dug, not metal by any means, was Sigue Sigue Sputnik. But, they never seemed to get any further than the Ferris Bueller Soundtrack.
How about Asphalt Ballet? Another poorly marketed, talented band.
Oh! A newer band that you should check out is Billy Talent. The name can be misleading, but they've got good stuff. It's a bit punky, I guess (think Warped Tour), but it's some great stuff.
I also hope that you haven't dismissed Marilyn Manson due to his imagery. I tell my buddies, who are still locked into 80's rock, that Manson's music is the natural progression to all the old stuff we loved.