Shrek 4 threw me for a loop. I kinda thought Shrek 3 had wrapped everything up nicely.
Honestly, I haven't even seen the second Madagascar yet so I can't say much on the issue.
The second one was alright, I guess... I enjoyed it, but not as much as the first. As for Shrek, they planned for quite a few more movies. Somewhere in the ballpark of 6 or 7, but they decided it ran its course at #4. And Puss and Boots... technically, they have five movies, but other than Puss, there's no connection to Shrek at all in the film. Not even so much as a cameo.
Shrek 3, I just had problems with the caustic relationship between Puss and Donkey being replayed from the second movie, especially since it just got a 2 line reference in the fourth. But above all, I love the fourth one (not as much as the second, though) because it came full circle. Shrek was always in a deep depression about being an ogre, but in the fourth, he actually complains about people loving him. If nothing else, that was a nice twist.
In the old days, a show like The Penguins of Madagascar would've probably aired Saturdays on a basic network like NBC. But instead, it airs on Nickelodeon, along with the Kung Fu Panda series. And the How To Train Your Dragon series is supposed to air on Cartoon Network soon. And Dreamworks is supposed to come out with a Monsters Vs. Aliens TV series.
By "working on" they've supposedly ordered a pilot. And that was quite a while ago, so we don't have any idea if it's going to happen or not. I really hope we do get a MVA series. We're not getting a sequel because it didn't perform in like some international market (they never disclosed which one). Wouldn't mind a Megamind Further Adventures series, actually...