Glad to hear there will be another series but as someone who judges anime series individually instead of by franchise I think the way any series ends matters. Slayers Revolution and Birdy Decode come to mind as other examples of series where I was disappointed by what I felt were weak open ended endings, even though both have sequels coming.

I suspect it was inevitable for Nodame Paris to end where it did because of the small number of episodes allotted, still it doesn't seem like the 3rd season was guaranteed when they 2nd season went into production so this could have been it. Ultimately I'd rather have 11 episodes and a lame ending over nothing but that didn't change how disappointing the end of the season was for me. I'm kind of saddened that the anime producers were willing to end the adaptation at such a spot without a guarantee that they'd get to continue later and reach a better breaking point but that's just business I suppose.