I've only read the good end for Demon Lord Gardis (because Grisaia happens), but so far it was fairly decent. I wish they focus more on the lore and history, the fantasy setting, the war and politics, the relationship between different races, and expand the scenario into something more grandiose since there's potential. But I guess I shouldn't have expected a stellar storytelling.
Christina attitude is very amusing I've fun reading her lines. Gardis is a pretty cliche character all-around but it works for TSR so I guess in the end it's alright. The sound quality for Lezette voice is incredibly horrible so my suggestion is to turn it off. Seriously, a muted Lezette is a good Lezette.
Anyway, this otome title is pretty good if you want some light reading.