I don't think this is the case and I hope it was nintendo's reasoning for the poor E3 showing.
Firstly, the 3DS had a bad launch so this was the sole reason for the negative press. It didn't stem from the fact they had showed off games which weren't made available day 1 (zelda, mario kart, kid icarus, RE, etc) but from the fact that nobody wanted the games that were available day 1, theres a difference. If Nintendo had only showed the 3DS launch titles, they would have been in worse position no doubt and would have received negativity both at E3 and launch.
At the launch of a system you always need to give a taste of whats to come, regardless of how hard a company tries your never gonna appeal to everyone at launch but you can reassure them the console is worth investing. Most of the people who bought the 3DS in the early months probably didn't but it for the launch titles (SF4, Nintendogs, Pilotwings) but for the games they knew were coming out.
Why Nintendo didn't show more 1st parties I'm not entirely sure, but I do know zelda and super smash bros may still be in planning stages, possibly the same with 3D mario if the team only finished working on 3DS game 6 months ago. But Nintendo has a ton of 1st/2nd party studio's, they should try and Utilise them as well as sony utilises their studios.







