Luke wrote:88. Metal Gear NES *new*
*obligatory "but you should have just played the MSX games" post*
But seriously, if you thought that game was good, you would probably find the MSX games to be fantastic. The NES game is a slopped together knock off of the MSX game at best, and nearly a different and, and imo bad game, at worst. Tons of missing dialogue, looks/plays/sounds worse, way easier, missing boss battles, entire missing sections, the NES version is significantly more confusing and random in design, the list goes on. Strangely, the OST is one part where I almost would say the NES version is better, as it has some unique songs that are actually pretty sweet. There is also a lot of the same though.
Not that I expect you to rush out and play the MSX version because some guy on the internet said it was better, but I would really would recommend you check out Metal Gear 2 sometime based on your post. It is an amazing game and legitimately one of the best in the entire series, and one of the coolest games of that generation I have played. If you liked NES MG it's basically guaranteed to be a home run for you.