All LEGO games I have and some brief opinions:
LEGO Star Wars - GBA
It's a bit short and only has like, 15 characters, but it's different, being isometric and all. Not bad for what it is.
LEGO Star Wars: the Complete Saga - DS
Played this one obsessively as a kid. I unlocked every single character! I went back to replay it not too long ago, but during a story mode cutscene, the game froze. The only way I could get around it was playing through that part on a different DS. Weird.
LEGO Indiana Jones - DS
Pretty similar to Star Wars TCS on the DS, but less interesting in my opinion. Still played it a bunch when I was little.
LEGO Harry Potter Years 1-4 - DS
This one is actually really different, with touch screen spells and actual dialogue boxes. It was okay from what I remember, but I haven't played it in years.
LEGO Batman - Wii
Pretty bland from what I remember. I also found it really difficult when I was little. I needed a friend to help me unlock the villain story mode, which was a pretty sweet addition. Never beat the game, though.
LEGO Batman 2 - PS3
Now this is a better game. I'm indifferent about the voice acting, but I had a really good time with this one. Might go back to it someday.
LEGO Batman 3 - PS3
I don't know what the problem was (maybe just me getting older) but I didn't like this one nearly as much as 2. Maybe I'll try it again sometime?..
LEGO Harry Potter Years 1-4 - PS3
Yep, I have this one for PS3 too. I didn't like it as much as the DS version and I never beat it. I actually got this one as a birthday gift in a little Walmart value pack thing, containing this game and...
LEGO The Lord of The Rings
Aw yeah, LEGO LOTR was great. Although pretty similar to the games before it, I feel it's one of the best I've LEGO games I've played. The open world was pretty cool, and it had a nice set of characters. Haven't played it in a few years though, so I don't know how it's aged.
LEGO The Hobbit - PS3
A friend of mine bought a PS3 that came with this game, and since he doesn't really like LEGO or The Hobbit, he gave it to me for my birthday one year. I didn't like the whole material collecting aspect, and apparently the game was only shipped with the first two movies' worth of content with plans to add the third as DLC. That's bad enough, but the DLC got cancelled, so nobody got to play Battle of the Five Armies. I got bored with it before I got to the end of the first movie, though...
LEGO Marvel Super Heroes - PS3
This one gets a lot of praise, and yeah, it's definitely not bad, but I got bored with it shortly after beating the game. I'm probably just bored of LEGO games in general, unfortunately.
LEGO Universe - PC
Only started playing after it went free to play. It got cancelled a while ago, and even though I was a cheapskate who never bought membership, I miss having it around. It was fun to mess around in with friends, not gonna lie. It's still on my taskbar... RIP in LEGO pieces.
BIONICLE Heroes - DS
Never got around to playing this one until a year or two ago when I saw it for like, three bucks on 99Gamers (Do you guys remember that site? It got shut down...). I bought it and I had a great time. Rather than the same LEGO game formula I've played over and over, it's a bonkle FPS. Not bad.