The 313 logo looking angry doesn't bother me at all, I just mentioned it as a fun observation. On the contrary, I'm all for logos having character and always been a supporter of "angry" logos. And as you said, especially since the Pistons logo set is so lackluster and unexciting.
What comes to the paint and the superimposed logo, it did cross my mind too that they might've thought that having red painted areas with it might be visually too much, but just picturing it in my mind I can't say it would. Moreover, the use of Pistons' bright red and blue colors is what had always made the court so visually appealing and losing that is a shame.