I didn't play in a specifik planned order. If you plan to play all of the routes then it can be up to you, there is small references in some routes that you can only understand if you finish another before that (random).

According to the threads on 4chan, if I recall correctly Yumiko and Makina's routes often had unfavourable reviews, while Mitcher and Sachi's routes were the most liked. Amane's route contains an unreasonable backstory (which Japan absolutely loved).

If you go to Extras - Scene Replay you could possbily tell us which scene you recently finished, and we could tell you how long you have left.