I recently started playing the first one and I'm pretty hooked right now. It is definitely a breath of fresh air in terms of game play and not to mention it is a good game.
My only gripe about this is you have to present the evidence and get the questions that the game sets in the first place. There were some instances where I have a piece of evidence that clearly helps me but since it's not the one the game makers "wanted" I got game over several times.
Anyone played any of the three games in these series??