The game is extremely forgiving in general, dealing out virtually no punishment for failure. There is no way that you can "lose" Lego Star Wars. Also, the single-player game isn't particularly long--if you keep your eye on the prize, you can run through all three episodes in just a few hours. But as you play, you'll gain access to other characters with which you can go back into levels you've already completed. Since different characters can have markedly different abilities, you'll find that there are areas in each level that you simply could not reach with the original characters. So, despite the game's relative brevity, it definitely encourages multiple plays. The game also has two-player co-op support, where a second player can jump in (or, alternately, drop out) at any point. The game feels like it was designed for co-op play, and the experience definitely benefits from having another warm body around.
The gameplay is generally enjoyable, if a bit easy. But what really gives Lego Star Wars its appeal is the way it's all presented--that is, with Legos. The game fudges a little bit on some of the level geometry, but the majority of it appears as though it were constructed out of those little Danish building blocks. All of the characters, even the various aliens, look like Lego people, and when an enemy or an object is destroyed, it will crumble into its component pieces. There are a few set pieces where the game looks downright impressive, but for the most part it keeps things on a relatively small scale. It generally isn't overzealous with lighting and particle effects, so the game therefore has a somewhat plain but clean look. The differences between the PC and console versions are purely aesthetic and relatively minor. The PC version simply looks a bit nicer, thanks to higher resolutions and some nicer-looking special effects. Beyond this, there are few appreciable differences between the three versions of Lego Star Wars, though we did manage to find a few Xbox-exclusive bugs--nothing show-stopping, but enough that, given the preference, you should probably go with the PlayStation 2 version.
If you want to go into Revenge of the Sith spoiler-free, wait until you've seen the movie to pick up Lego Star Wars.
Despite the game's unusual look, if you were to close your eyes, there would be no mistaking this as anything other than a Star Wars game. The sound plays as big a part in establishing the tone in Lego Star Wars as the graphics. With no voice acting to muddle up the affairs, blaster and lightsaber effects are allowed to take the stage, accompanied nicely by all of the classic John Williams music that has become inexorably linked to Star Wars.
This is probably one of the better kids' games to hit the market in a while, and that it's clever and charming enough to appeal to adults is a testament to that fact. The novelty of watching a little Lego version of Obi-Wan Kenobi duel it out with Darth Maul certainly accounts for a large portion of the game's appeal, but on its own merits it's a fairly fun, inventive little game.