I am playing CH3 beta right now. [edit: finished it]
CH3 is much more mature, technically better. Difference between CH3 and CH2 is bigger than between CH2 and CH1.
CH3 seems to have far more depth. Dialogues, characters' building, everything is WOW!
The game MAY be boring for people w/o patience. But good NTR needs proper build-up. Do you remember Kubel's Pillory? Here intro is comparable long, but much deeper and more touching.
I just hope
N_taii won't screw sth up with cliche "bad energy causes girls' mass corruption and everyone fucks them easily".
Intro is perhaps BEST one I played ever.
N_taii is really progressing, deserving Patreon's pledges. I mean it - every work is better than earlier ones.