A lot of people really didn't like that game, and found the first person platforming really confusing. Personally, I didn't have a problem and thought it was a really great game. I played it on xbox though, don't know if there any issues with the PC version.
OT: I picked up Orcs Must Die and...
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Probably not, purely because if I could have anything I want from the press of a button, I would be so bored. A thing is way more entertaining to have when you know you've actually worked for it, not just pressed a magic button. The people's lives don't really come into it.
The problem is that creating a sequel is the easiest form of marketing that there is; people see a game with a 2 on the end, remember the original and pick it up, even if said original was only okay.
Another problem is IP ownership; a developer is going to genuinely care about their IP, and...