I missed the group play-through, but set aside some time this weekend to complete the game. I never played DOTT before, I preferred pirates and skeletons, but I'm hoping to enjoy Tim's entire catalog starting with DOTT.
My initial impressions, after just completing the game an hour ago, are positive. The multi-character gameplay was brilliant, as well as the concept of sharing inventory items. I also thought that the voice acting was spot on, and made the game even better by adding depth to each character. Humour is a must-have, and DOTT was not lacking in this department. On the other hand, I hate accidentally solving puzzles without knowing what purpose it serves in the game. I found myself accidentally solving a few puzzles without knowing what the payoff was going to be: statue swap, cigar teeth, etc. I also prefer a strict linear approach to control the user-experience. I also found some puzzles illogical: why did I have to read the book to the horse, there was no clue to explain this; I'm dumb about wine so I didn't even think about making it age into vinegar; why did I have to give the crook keys when he was already using a crowbar that would eventually work... etc.
So, after playing through, I would look to improve upon the multi-character gameplay, shared inventory (and explain the drag&drop; sharing experience between characters), definitely invest in high-quality voice acting, let Tim run wild with the story and dialog, make sure that puzzles are logical, control the user-experience, and by all means - ensure that every puzzle is solvable at the correct time!
Looking forward to the next game in Tim's catalog, Full Throttle?
*edit: forgot to highlight a wonderful surprise - Dr. Fred Edison (DOTT) is the same voice actor as Dr. Loboto (PSYCHONAUTS)... that put a smile on my face - as well as all the Star Wars references*