This is an excellent show.
This show is definitely appropriate for most children and teenagers. There are a few things I'm feeling iffy about when it comes to sex in the show, since the whole plot kind of revolves around Van getting Cheyenne pregnant. Most of the episodes are appropriate for any age, it might just be me, but I wouldn't show the pilot and the following 2-3 episodes to anyone that hasn't had the talk. There will be a lot of questions. I mean, you don't "see" anything, but some of the storyline in the first few episodes could arise some "huh" questions, like in the pilot about the pregnancy test and following episodes where Cheyenne gets morning sickness and "accidentally" lets out some info when Jake's friends' Mom is there.
As for violence, in a few episodes Reba hits Brock but nothing serious. Brock doesn't get hurt but I can definitely see Reba has somewhat of a temper.
Commercialism; I don't see much of that. Maybe I just don't pay attention to the issue, but I haven't really saw any brand names mentioned much in the show. Game Boy was mentioned once in the episode where Jake wanted to take his Game Boy to church but Reba wouldn't let him. Otherwise... I can't remember anything.
Conclusion: The show is pretty much appropriate for all ages, especially ones that have had the talk and/or understand some of the stuff in the show. I started watching it back when Season 1 was airing; I probably didn't understand anything, I didn't ask either, didn't really pay much attention to the details and I'm not scarred for life, so you'll be fine too.