Disclaimer: I am reviewing this product based on the series not the DVD release. The DVD itself appears to have 6 episodes - those following the ones from Volume 1 - and a variety of special features.
Animated series these days often seem to be severely split between the "Dora the Explorer" age category and the "geared for adults" titles of, well, "Adult Swim" (e.g. - "The Venture Brothers). Finding something for the youth in-between - those who are still kids, not quite teenagers - isn't always as easy. It gets even tougher with superhero-based animated series: comic fans have become an older demographic and animated series starring comic book heroes are geared towards them, not younger viewers (e.g. - "Justice League" or the recent "Wolverine and the X-Men"). So it's nice when a series like "Marvel Super Hero Squad" comes along - juvenile enough that you feel your kids can watch it but not so young that they'll lose interest with "That's for little kids" comments.
MSSHS takes the premise that the Marvel comic characters have the heroes all living in one city - Superhero City (headed by Stan Lee, er, The Mayor) - and neighbour a villainous "state" headed by Doctor Doom. Many of the heroes work for SHIELD, the X-Men attend an actual school, and various other little ways of making it so the writers can basically go use any Marvel character they desire without having to deeply worry about "team affiliations" or such. The core heroes featured in the series are Iron Man, Wolverine, Thor, Reptyl, Falcon, Silver Surfer, and Hulk (sorry, no Spider-Man in season 1); there are frequent appearances by Ms. Marvel and Captain America in most episodes and the episodes of the season bring in many other characters ranging from the relatively obscure (Heroes for Hire) to iconic (Fantastic Four). So chances are if your child has a favourite hero - or you do - that he/she shows up at some point in the series, quite possibly more than once. Same goes for the villains - it's Doctor Doom and his henchmen MODOK (hilarious), Abomination and Mole Man but -plenty- of others show up in the series.
As noted, the tone of the series is young - maybe around Smurfs level (but with a few more flatulence and mucus jokes than that era; nothing -too- repulsive or overdone...about in-key with what you see in many G/PG movies these days). The heroes and villains may fight but no one is ever really hurt/injured and there are the obligatory "good lessons of the day" in each episode. It's done in a manner that's fun enough - plenty of quips and action - to keep the kids amused.
The thing is, while you're sitting there watching the show with the kids for the first time - let alone the potential umpteenth reviewing children are prone to do - you don't want to go stark raving crazy. Fortunately, if you enjoy the genre, there's plenty of things here for you too. The writers toss in both nods to comic history - the opening titles of each episode, for example - and little "wink wink nod nods" to the adult viewer (e.g. - Cap (dressed in a Confederate uniform, heading out for vacation at a Civil War re-enactment): "Tell Brubaker to relax. I'll be on time."..hangs up phone.."Sheesh. It's just the Civil War. What's the worst that could happen?" ) If you get the joke, you may even be the sort of person who enjoys the series enough that you needn't view it with kids. There are plenty of amusing moments if you are okay with the "toned down action" and the unusual animation style. This may not be the deepest superhero series out there but it'll make you smile and, sometimes, that's what you need.
The show doesn't take itself seriously except with the intent to amuse its' target audience and it does that well enough. It's tougher and tougher to find a good link to superheroes for kids these days - too many other mediums have Wolverine eviscerating someone or Captain America being assassinated or the Joker killing/crippling someone (not saying those are part of bad stories but not for children) - so this is a nice change of pace. So check out Marvel's version of "The Super Friends" and laugh along with your kids.