Spielberg is constantly accused of sentimentality, and War Horse is easily one of his most unabashedly sentimental films, but that's actually one of the things that makes it work so well. A throwback to an earlier era of cinema, when irony was not the norm, War Horse is a proudly earnest film that makes no bones about its desire to tug your heartstrings, but that's part of what makes it so great.
Arguably Spielberg's most fun movie of the last 17 years, Catch Me If You Can is one of those movies that makes it all look so effortless that you might take for granted the level of craft that Spielberg and stars Tom Hanks and Leonardo DiCaprio put into it. While not possessed of the sense of importance that other films in each man's filmmography might have, Catch Me If You Can is nevertheless a high point in the careers of all three.
I would love to see Stanley Kubrick's version of A.I., but since Kubrick didn't get to make the film that he spent so many years developing, I'm more than happy to settle for the Spielberg version. While reviews at the time of its theatrical release did a lot of comparing of Kubrick and Spielberg's styles, and speculating about Kubrick's version (presumed to be better), Spielberg's vision is one that has incredible staying power and is deserving of critical reassessment.
A dark vision of the future (some elements of which have already come to pass), Minority Report is one of the best science fiction/action movies to come out so far this century. Amazingly the first collaboration between one of the most commercially successful directors of all time and one of the most commercially successful actors of all time, Minority Report remains a highly entertaining, compulsively watchable movie.
Like Catch Me If You Can, Lincoln is a movie that makes it look so easy that it almost masks the skill that went into it. Built around an excellent performance from Daniel Day-Lewis (not that there's any other kind), Lincoln is a surprisingly funny, engaging, and ultimately quite moving film about one of the most important periods in American history.