Hey KeeperofLindblum, I'm the admin of RetroTracks so I thought I'd chime in here after seeing the site pinged
Sites I'd recommend for various platforms would be:
Megadrive - http://project2612.org/
Amiga - https://www.exotica.org.uk/wiki/UnExoticA
SNES - http://snesmusic.org/v2/
NES - http://slickproductions.org/nsfe.php
Arcade / Sharp X68000 - http://vgmrips.net/packs/
Playstation - http://tzone.org/~llin/psf/
General - https://www.zophar.net/
Those are all the ones that immediately come to mind anyway.
When you said the site was "kinda spotty" did you mean that it's spread over various platforms rather than having a complete library for one platform? If so, that makes sense as I'm mainly adding things "by request" these days (because I didn't want to add rubbish, but had run out of personal choices). So on that note, if there's anything specific you're after that isn't on the site yet, let me know and I'll add it.