I actually really like R-type Complete's soundtrack. It's not the sounds, or style I would've chosen in most songs, but, it's different then the hucard, which is nice, since I have both.
I'm never going to compare Monster Lair to Gate of Thunder(I believe produced by Nick Wood), but I enjoy both for what they are. Yeah, Monster Lair's synths are cheap, but, IMHO most Telenet games are much cheaper & cheesier sounding in the synth department. With some exceptions, like Valis 1 & 2, the Exile's, the Cosmic Fantasy's. I'm sure there are a few other's. Even then, there are still songs I enjoy in Last Alert, Psychic Storm, Final Zone 2, etc. Despite the fact that most of the sounds they use, really irritate me. I feel like they should've known better. Frankly, I'd love to redo alot of those soundtracks, & redistribute them. But, there's not enough time in the world to do that.
As for Vasteel, it's an amazing soundtrack, but doesn't fit the game. I haven't really played enough of the 2nd game to see if the music fits it. Now that I think about it, I feel like alot of those Telenet games, had them using Casio's or Yamaha's(leaning more towards Casio's). They just have really bad synths. Not that I'm an expert, but, I just trust Roland.