I'm sure there's some level of nostalgia that makes me enjoy this soundtrack so much, however I feel that it is very strong. Having aired in 1979, there's a whole lot about Gundam that exemplifies the kind of style of anime from the 70's and early 80's. It certainly isn't for everyone, but even has a kid in the 90's I was able to appreciate just how cool this anime was, even up against the likes of the then recent, New Mobile Report Gundam Wing.
https://www.youtube.com/watch?v=l24_0SH3VK8
This song is one of my favorites from the series, and plays at the end of the third movie. Originally Mobile Suit Gundam was entirely unpopular in Japan, and was later re-edited into a three part movie. For those of you that prefer more of a contemporary rock sound, you might want to check out Andrew WK's, Gundam Rock, album.
https://www.youtube.com/watch?v=2HtTN7v8K7o
Personally, I don't feel like I can go wrong either way.