I loved the first open season, for me its not just for kids, there was a sense of intelligence about the whole storyline, I found it funny and very easy to follow, Ashton kutcher being Elliot made it even better! There is just something about his voice that's funny. But after watching this, its like a totally different sort of film, the whole thing is all over the place with scenes cutting in quickly, different sorts of music accompanying the script, its just makes it so hard to follow, a complete mess in my opinion. There was nothing intelligent about this film at all and yes maybe a kid may enjoy the colour and the silliness but its a complete let down from my prospective. The actual script itself is just so silly and makes no sense, the one other major huge let down is that Ashton Kutcher is no where to be heard, the character Elliot is no longer funny, the voice is just a bit flaccid and has no edge or likability factor. One other thing I must mention is also the animation quality seems to have suffered as well, there is just something off about the scenes where it doesn't seem no where near enjoyable visually then the first one.
My advice would be if you enjoyed for the first one like I did then don't bother watching this and just keep the memory of the original.