Idk I think value depends on your priorities. If you want a long game I wouldn't recommend any Metroid game. But if you want a really polished and good short game that you can replay a ton I would. I don't think value is always related to length because that Resident Evil 2 remake from a few years ago was one of the best received games that year and you can beat it in under 2 hours easily. Same with almost every Metroid game. People still talk about Zero Mission and you can beat that game in an hour. A 20 hour long 2D Metroid I don't think would even be a good game tbh.