Well to be honest, I'm not sure how many animeviewer used to read the character bios, but I do understand your valid points too.
It puzzles me why they didn't spent that 20-30 sec to explain just what's going on (I would have appreciated that more than Battler's breast fetish for example), especially if they even detail it on the website.
In any case, I personally kinda feel/felt bad for telling something to a "casual" viewer, which he/she could find it out for himself/herself on the official site, even if it's technically not spoiler.
Edit: Something worthwhile to check out by the way:
Satirical comparison between anime Umi episode1 and the game. Some of those are quite funny to be honest
.