I would say it's a very typical superhero action movie. It's quite entertaining watching it, lots of actions and animation effects for your eyes. It's like watching a real-life version of a superhero cartoon, totally mindless, a good movie to watch as a break after your work.
However, i'd say that the plot is almost quite predictable, any average movie go-er can easily guess what will happen next.
Anyway, Dr Doom is backed again, though same as the previous episode, he doesn't have much scenes. That's because most of the show is focusing around the new character : The Silver Surfer.
And i'm actually quite disappointed that the movie didn't show the face of Galactus, only his powers when he's feeding the planets. Though i must say the effects are quite good.
Spoilers :
The silver surfer has arrived on Earth and whatever he goes, there's some changes to the weather, the seas in Japan freezes, Egypt starts to snow, and in New York, the power is cut off wherever he went pass. It came to the alert of the US Army and they tried to get the help from Mr Fantastic to locate and capture the Silver Surfer.
After a failed attempt to catch the Silver Surfer in London, they finally managed to separate the Silver Surfer with his beacon, aka the Surf board. But that is after the Army has got Dr Doom to help as well. Thus after the capture, our villain turned against the army general and got the beacon for himself.
Knowing that the real devourer of the world is another mightier enemy, the fantastic 4 then tried to take down Dr Doom. They transferred their powers to the Human Torch, and whoof, he got all the powers of the 4 and took down Dr Doom. Nevertheless, the devourer, Galactus, has started to devour the world. The ending....... go watch it yourself, haha