I'm not sure why you did this. The 3DS library isn't filled with hidden gems. People are aware of the high profile titles. The guy you're replying to isn't going to be blown away with your library or eat a pile of crow because he neglected to mention Let's Golf 3D. In fact, in reference to his "5 games" claim, you replied with a list that had... 5 retail 3DS games. You then listed a bunch of DS stuff which he can almost certainly have played on his DS(i), a bunch of Game Boy stuff which may or may not be something he's willing to get into and may or may not have been stuff he already owns from 20 years ago.
This doesn't address his concern, it just reflects that you have different tastes from him. There's nothing on your list that screams out being a hidden gem that the person you're quoting is likely to have ignored or missed due to lack of awareness.
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But regardless of the reasons, when people say the system doesn't have enough yet for them to jump in, it's not a pernicious conspiracy to marginalize Nintendo's contribution to gaming, it's because what's available so far is not very robust. I'm sure there are people out there and on GAF that have console warrior type tendencies to the point that they could be presented with their dream lineup and they would still not buy a platform because it's made by the wrong manufacturer, but by and large the people expressing their opinions, positively or negatively, on the 3DS are being sincere in my estimation.