What I don't get about the Skrulls...

Ok so I've been reading this "Secret Invasion" event that Marvel Comics has started to unfold. And personally I don't get it. I think its a cool idea that the skrulls have started to invade Earth, however what I don't understand is how the characters in the marvel universe can be so easily tricked. Most definity I look at Reed Richards, the smartest man in most of the Universe. Not only is he so smart he would easily figure out what is going on, but he has FOUGHT the skrulls numerious times. Reed, in a matter of minutes, could devise a 'skrull detecting' ray of some kind and see once and for all who or who is not a skrull. Not to mention that the skrulls still do not fully grasp every human aspect in terms of behaviour and emotion... it would be so easy to indentify a skrull by the way they act(those overconfident bastards!)

As for manifesting ALL THE POWERS of any hero, that I find a bit of a stretch... For instance, I sincerily doubt that anyone could impersonate the Hulk because of his unmatched power (If he is still around, I didn't read World War Hulk yet). Thor would be easy to detect if he is a skrull or not just by lifting his hammer, if you can't lift it, it is mystical and he is Thor of Odin. Spider-man can't possibly be a skrull because of the "brand new day" saga that is happening in his own comic. Do the skrulls know how his Spider-sense work? Trust me, Mephestio would know who is who. As for Wolverine, do you know how complicated he is??? His healing factor alone is rediculous, but what about his devine sense of smell? If Daredevil accidently mentions anything about being able to actually see... he is a skrull. If Iron-man almost dies without his armour, then he is real. Do the Skrulls actually know how pheromenoes work with Spider-woman (aka Jessica Drew) and how she can manipulate men with her powers? Even Luke Cage's attitude and powers are difficult to duplicate, can skrulls copy the powers of an unbreakable man? And how can skrulls duplicate Dr. Stranges KNOWLEDGE, not even magic, but KNOWLEDGE of the mystical arts. The Skrulls would need to know every single enchantment.

I personally think that to replace ANYONE with a Skrull is a stretch. When you think about how diverse and complex alot of the main characters powers work, I don't know, maybe they should look at the weaker charcters with no outstanding powers who were like Electra first, because by that time Richards will find out how the skrulls can copy every ability.

ps.

What the hell was with Yellow Jacket being a Skrull? Obivously if he is best friends with Stark and Richard, they would be able to tell just because they hang out a lot. Skrulls aren't that brilliant of actors.