There's a definite divide between pre and post-NES, and I'd say that there are few games I like which came prior. However, I can appreciate the design of games for their era, like the ones you mentioned. Even though I don't enjoy playing most score-based games.
Had Galaga '88 been an early release on the Famicom, I would be more appreciative. But, it came out the same year as R-Type on PCE. To me, it's clear that Namco was still focused on the past.
A game series needs to grow and struggle to stay relevant. Anyone who likes the NES, will likely place Super Mario Bros 3 in their top 5 games. While the first SMB was a great game, too, Nintendo added a ton of new features for that release. On the other hand, Galaga '88 didn't do enough to update the gameplay.
This might make some sense if you weren't talking about the masses of people enjoying these games decades later while dismissing a game for not being different enough than a game released years earlier.
Ha, that is true, not to mention that Galaga and its ilk keeps getting re-released, remade, copied, etc., and still gets played or at least fondly remembered. Then you have games like Robotron, which has spawned entire an entire subgenre, and copycat games with only graphical differences are still getting played by the masses.
But I think the main divider is whether you are into score chasing or not. Most modern games, either through achievements or score, place this goal in addition to the end game as a motivating factor to the gamer. This is smart in the developer's part, as it ensures their games have a wider audience by appeasing to different tastes.
Finally, as a side note, I would not place SMB3 in my top 5 NES games. Hell, I'm not sure it would be top 10. In fact, I think the original SMB is the better game; more concise, infinitely playable and approachable, and every single level is expertly crafted around it's obstacle course philosophy. SMB 3 is just more of the same, but it diluted that formula too much for me, so it's more of an adventure than an arcade action experience, drawing out the action among all the map hopping and mini games. Still a great game, but I just love the purity and perfect level design of the original, and it's the one I always go back to when I want to romp through the mushroom kingdom, old school style.