Of course Mario games will get better and better over time. In fact Mario games are better nowadays. I´m 23 but I definitely don´t judge on nostalgia goggles, and while I know (and had experienced at their correspondent time) how much each of the Mario big hits mean to the franchise´s history, I can recognize a new good game when I see it.
Some of the newer games are properly praised (for example, the Galaxy games), and some aren´t (Sports Mix) but in general, while the Mario series has had it´s failures, in general it´s still in a great level of quality.
Or maybe I´m just a biased Nintendo fanboy. Whatever.
Why not a new great 2 or 3D Adventure at least every 2 years?!
In my opinion, I think I prefer less games (not to the point of the GC era though, when the only platformer was Sunshine) because less time to develop games means shorter games. Take a look at Sonic for example: while I really like it´s games, the newer ones are much shorter than, say, Heroes or Adventure, because Sega is milking the franchise as much as possible these recent years, releasing a lot of games per year, which means you can complete their recent games in two days when the older ones took me two months (granted the Adventure ones abused the chao garden bull*bleep* for fake longevity, but Heroes and Shadow were genuinely long, and so were the sports and spin offs like Sonic Riders)
