Pros:
-He is not laying off people, and being a developer himself he has insight on what makes his employees tick
-He has the company focus on quality games rather than mere quantity and monetization
-Expanding Nintendo (at least in Japan)
-Somewhat improved the situation for Gamecube
-Ended the Game Boy Advance with grace
-Launched the immensely successful and profitable DS line of systems
-Launched the immensely successful and profitable Wii system
-Turned 3DS around in a fairly quick manner
-Has fairly good relationship with Japanese third-parties (especially recently)
-Decent management of money, hirings, and resources
Cons:
-Lack of focus on Western advertisement
-Lack of relationship with Western third-parties
-Mistake with launching 3DS at such expensive levels with such few games
-Wii U's launch and current situation
-Terrible Network services
-Lack of focus on other multimedia and device functionality
-Lack of Western expansion
-Delays!
Other things to take into account:
-If Iwata resigns or is fired Nintendo's shareholders will most likely elect someone who takes Nintendo software-only and into smartphone territory (quantity rather than quality) and lays-off much of the workforce in order to restructure. As a person who deeply likes Nintendo's games and talent I feel it would be a great loss if such a change were to take place (such a change at Sega and Atari not only caused them to drop hardware, but it also caused many of their IPs to die because the company could adapt to developing on so many platforms with a fragmented user base)
-Many of cons I stated can be dealt with at other portions of Nintendo (I am really looking more towards changes at NOA and NOE with their constant marketing failures).
Based on this I give Iwata a big fat Aye!
But it does not matter what I think, if he fails to give shareholders an operating income this year he will either resign or they will fire him, and even if he does give them an operating income even then I believe he will be at great risk of losing his position (shareholders have been known to make quick choices and they have their own levels of what is satisfactory and what is not; and with Mr. Yamauchi gone I feel there are fewer people who can protect Nintendo's management [maybe his family will, but that is not certain]). It is sad for me to say this but I feel Nintendo's days of focusing on quality is at risk of falling short unless Iwata presents shareholders with decent financial numbers (I will certainly be watching Nintendo's IR page on Jan 30th because those financial numbers and the April numbers will be a good indicatation on whether Iwata will be re-elected come this June).