Not entirely sure about this one, but Nintendo hasn't exactly done a whole lot to improve their image in that regard. They're still pretty old school.
I disagree. Nintendo has done a lot over the past 10 years to make developing on their platforms (both console and handheld) much easier and more friendlier. To say that they still have the same mindset and operation with third parties since the advent of the 3rd party drought is disingenuous.
I find it weird that with every successive generation, Nintendo has had great difficulty getting triple AAA 3rd party support and/or 3rd party support equal to its competitors. From an outsiders perspective, it seems like the things that makes Nintendo's systems the most unique are also the things that 3rd parties balk at.
GameCube Gen: Had better hardware AND was easier to program for than the leading third party support console (PS2), but the controller was unique and didn't make for one-to-one ports easily.
Wii gen: Had the fastest selling console in history and was market leader for the entire generation, but the controls were too unique and the hardware was weaker than the competition, which got better third party support.
WIIU GEN: unique controller and relatively weaker hardware but also, more importantly, a different architecture to program for than the other competitors.
I think Nintendo needs to create teams to work with 3rd parties on certain, but not all, AAA 3rd party multiplatform titles (your GTA's, certain EA and Bethesda games, etc.). They also need to work on having better ad campaigns for games period.
Ultimately I don't think Nintendo will ever get comparative quality third party support, especially from the west, because of one thing: 3rd parties want all platforms to be the same. Same control scheme, same program environment, similar restrictions, and no gimmicks. This makes sense financially as it cuts porting costs way down while allowing your investment to be spread across a wider audience. It's why I believe ports for PS4, XBONE; and PC are being announced altogether now (vs before when the PC version was always in limbo) because the architectures are all super similar. The WiiU is getting shafted simply because it will take the normal effort and investment required every generation of gaming to program for instead of using similar architecture as the other 2 (which PC is only benefiting because it is also the same). This explains to me why studios are announcing multiplatform games for systems with zero install base and not for the WiiU. 3rd parties take the least path of resistance financially and I doubt even if the WiiU was selling like the Wii did, that we'd see anything other than token 3rd party support.
Long story short, Nintendo's dedication to standing out and make gaming interesting with each console cycle is antithetical to what 3rd parties want from consoles: uniformity, conformity, and no gimmicks (at least ones they can't ignore).
Just my opinion.