I've put about 5 hours in and have had no issues with the screen size. I agree with Mad D, too... it's a great looking game, the visual overhaul is nearly perfect. Close enough that it's heavily reminiscent of the 64 version, but upgraded enough that it looks like it belongs on the successor to the DS. As most expected, this is easily the 'go-to' game for showing off the system.
The 3D effect also gives the world a ton of depth, which I think goes far in alleviating any worries about the small screen. It sounds goofy, but it really is like looking through a window to Hyrule. Either way, unless you're seriously blind, screen size is no issue.
In regards to the Club Nintendo thing... honestly, why didn't they just do it that way the entire time? If they track when surveys are done anyway, why go through the extra step of the prompt? Seems strange to me, especially given that this new way is exactly how they did the Phantom Hourglass giveaway all those years ago. Keep it simple.