Wes Anderson is OK. I never watched Moonrise Kingdom but I loved Grand Budapest and Life Aquatic. In general his movies are really nice to sit down and watch due to nice set design and a good flow of jokes, on top of that the soundtracks are also usually top notch too.
I don;'t know about Fantastic Mr. Fox but I think it'll be a purely OK movie. Like the rest a solid 6 to 8 out of 10. Just expect it to suddenly become sad at the end to make it a cruel twist like Ned dying, or Zeros wife and child dying off screen and the implication that Gustave was executed dumped on you in the last 5 minutes. It seems that Anderson just feels the need to even karmic balance his movies by having it be all glib and peppy then get someone offed.