Wow. I have not spoken of Monkey Island in like...forever.
My personal favorite, however, was the second one. Followed by Curse. Then Secret. Then Escape.
If you ask me, the whole 3d thing was kinda eh, and the controls were a bit messed up and stuff. As for the first one, I liked it but of course once developers get the first one under their belt, they're more likely to produce a better one the next time around, which they did. Curse was good, I liked the plot and the way it was drawn as well. But LCR was awesome. I liked the different islands thing, it was fantastic.
I wish they'd come out with a Monkey Island 5. Obviously they won't at this point, but it would be so cool if they did.