Yeah I really think they did. It really did feel more of a book on screen rather than a film adaptation of a book. For better or worse. Personally didn't feel The Big Lebowski comparisons as much as watching it like a Fear and Loathing type of movie. The plot wasn't confusing because I never tried and just followed Joaquin through the scenes. I think the Red Letter guys got to that later on in their review. There's no need to really focus that much on the plot because of how convoluted it is, but it is funny convoluted, and you just really have to understand Joaquin smokes a lot of pot and has some strange interactions. Because if you try to memorize all the characters, names, relationships, etc... you'll probably get frustrated and not enjoy it.
My only complaint would be the scene towards the end with Shasta which kind of broke the tone and pacing of the rest. If they had maybe trimmed that down and cut a little bit here and there, two hours would have probably been perfect and made it a little more accessible. Wouldn't get my vote for the Oscar though. Too bad, really wanted this to be great.