I've not seen all of this, so this might not be as accurate as some other reviews, however I shall try my best.
First of all, I don't think it preachy at all, and the action is so much that I laughed when I read this.
But on with the review.
The show is definitely NOT a kid's show. It is entertaining, it could even be kind of... lifting(?) to watch at times, because of the families that Robin helps. Robin could even be considered a decent role model. However, the violence is rather disturbing. Despite Robin Hood's refusal to harm people, the Sheriff's blatant disregard for life is, as I said a minute ago, highly disturbing. The always in danger feeling that this show produces kind of get's a little old at times, leaving you wanting SOMETHING to go right.
This show has some pretty funny moments, and the cunning that the characters have adds a ton to the show. I could do without the more... Romantic aspects of the show. I don't think it's that bad... A lot of flirting, a ton of kissing from Robin Hood... But I suppose nothing that I can't just fast forward through xD.
All in all it's a pretty good show, something better to watch than a lot of other junk on TV today.