I finished the Mashiro route. It was... almost the same as Rika's in terms of writing quality, nothing really surprising or noteworthy last I checked. The romance was a bit of a step-up compared to Rika's though, and I did like that... but without external rival to work towards I guess Mashiro's entire arc was mostly about getting Misaki and her motivation back. As of now, my personal rankings would be Rika at fourth, and Mashiro at third. I will be reading Asuka's route next.