Captain America easily stands above the rest of the movies released this summer, and over the entire superhero genre by a huge amount. This movie portrays Steve Rogers as a real person without making him overly corny or goody-two-shoes, and represents what a hero should be. The setup is solid, though there are one or two points where it almost starts to drag; this is easily redeemed by the second act of the movie where we see Captain America become the soldier and icon that he is destined to be. The ending, while blatantly left open as a tease for next summer's "The Avengers", still brings the plot to a reasonable and enjoyable (if a bit abrupt) conclusion. Character-wise, Chris Evans turns out an excellent performance in the lead role, showing us that it's more important to be a good person than a strong one; Hugo Weaving is equally fantastic as Cap's dark counterpart, portraying an antagonist who is both intriguing and terrifying. The supporting cast also shines, with noteworthy performances from Stanley Tucci and Tommy Lee Jones. All in all, Captain America is a must-see for the summer. It easily out-performs its comic book brethren, and is a viable movie by its own merits.
I can identify exactly where this movie turned sour for me. Despite some questionable changes to canon story information, it's actually pretty solid up until the last 20-25 minutes. Then, it not only creates some serious deus ex machina plot devices, but ruin what could have been one of the best characters in the movie. Still, it's OK I guess. Not awful, but certainly not as good as it could have and should have been.