In defense of Lindelof labelled ''the mystery guy'' :
This following internet defense speech I once read was pretty much on spot imo:
''... Lost was an ongoing show, not a finite series, and 22 episodes a year eat story ideas voraciously. By the time ABC gave their approval for the end game, the show had sprouted too many loose-ends-filler-ideas to resolve neatly...''.
On a side note, his state of mind at the very beginning of 'Lost' was that it was going to be cancelled, nobody was going to watch it, before he was told that 20 million people watched the season première, and had trouble to cope with it.
Not giving answers to the audience while he is keeping them for himself is very different from him being absolutely clueless. If ever he thought that it was our job, not his, to solve mysteries he has thrown out, then I would be pissed off, but that didn't seem the case with 'Prometheus'.
For those who listened to DL's audio commentary, you can maybe remember this part : ''...I think we have some cool ideas as to exactly what the Engineers were up to...''. At least there were seeds of enlightenment in reserve back then.
About missing the point :
Making the Space Jockey relatable to us, making him a giant humanoid, is missing the point, yes. I mean, even if they took the same route of it (SJ) being a suit, but with an unseen, bizarre lifeform inside, it would easily have our approval. As stated by David Levy in 'The Furious Gods', people working on 'Prometheus' not liking the Engineer as the SJ at first and then finally liking him is more of a diplomatic answer (well, that's what I like to think!)
I prefer the SJ fused with the chair but how can this concept make its way in the movie, also knowing that Ridley has a penchant for pratical effects ?
I often think that 'Prometheus' started extremely well with the giant saucer giving a sense a great intensity and 'alienness', especially when it verticalised, it was kind of a implicit promise that says ''hang on to your seat, we will do the rest'' but it was put on hold from that point...
That being said, it is funny how I can find many weak points to this movie but still I do appreciate it very much.