The first few missions are indeed far too easy, it gets a lot better further along the way though. Also, there's no comparison between the Xbox360 / PS3 version and the PC version in terms of artificial intelligence and how guards react. They have changed quite a bit. For example, alarmed guards won't be fooled by a simple 'blend' trick, you really have to get out of their view... also, stay around too long and your weapons / gear will give you away and guards will attack.

It's pretty annoying that the first part of the game is incredibly mainstream in terms of difficulty and yes it's boring. The tutorials are downright annoying for more experienced gamers. If it weren't the great graphics, overall coolness factor and if it wouldn't have an interesting setting I would probably already have lost interest in it long ago.