I wouldn't change much beyond stopping making characters as one-dimensional and trying to keep things more authentic to the games. The anime is good as is. It's very popular and does its job of selling the games well.
It's basically unpopular with people here, who are all older than the target audience. It's like watching a kid show and then deciding that it needs to be retooled so adults will like it.
"Murder of the living is tragic, but murder of the idea is unforgivable." - Janus, speaker of the synod