Almost without exception I thought the puzzles were absolutely top notch. The satisfaction on knocking the captain off the Narwhal, as well as finding the axle for the last spin-wheel thing were excellent!
My favourite puzzle though, possibly of all adventure games EVER, was the one in the lab when you are restrained. It wasn't particularly hard, probably took me 25 mins all up, it was just a great learning curve, and such satisfaction when you pull off what you realise needs to be done. The masochistic monkey just added to the delight!
My least favourite... starting the fight in Club 41. When I was turfed out I thought I had to do something else. Was quite surprised when I realised just getting in the door was the whole task. Just involved finding the (pretty obvious) pass and absolutely nothing more.
There was that great 'out of sight puzzle' in MI1 (or was it 2, it's been a while?) in a mansion which was a huge joke when the unbelievable options you would have picked appeared on screen, while you saw nothing of it. If this was trying to replicate that joke, it pretty much failed.
But generally the puzzles were pitched (to me) absolutely perfectly.
How far off is one month away, again? Aaaargh!