He delivers a serviceable performance and is certainly a sympathetic character, even with consideration for what he's unleashed by the film's end, but at it's core, "Rise" isn't Franco's movie...
... it's Andy Serkis' film. Serkis plays Caesar and it's (at least from what I gather) done very much in the same way as how Serkis played Gollum in the "Lord of the Rings" movies. His performance combined with the CGI is absolutely magnetic and whenever Caesar is on screen, he takes command of the scene. One of the scenes in the film that pays homage to a classic line from the original, is just as huge for "Rise" and it's largely due to just how strong Serkis' performance is. His Caesar is caring, cunning and vicious when needs be and it all is part of a fully realized character. Serkis has certainly set the bar high with his previous performances in this fashion, and with "Rise" he raises the bar a little higher.
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But really, it is Andy Serkis' film. Even with the problems that I have with the film, Serkis' performance combined with the visual effects just make "Rise of the Planet of the Apes" a very engaging ride. The seeds have certainly been planted to continue this beyond, and the suggestion is there that what could come next could be more in line with the original movie. Part of me would really love to see that, but the other part really wants to see what happens in the almost immediate wake of the ending of "Rise." There is huge potential in this franchise's re-birth if given the chance, we'll just have to see.