Any crowdfund is a gamble since you are investing in an idea/product. It's an interesting concept and I still enjoy it, but I'm far more selective in what I invest in these days. In total I have helped crowdfund 13 products, not all are games, and the one I regret to this day is MWO as a collosal disappointment.
I go by these rules if I have money to invest at the time:
1. Have they delivered any previous crowdfund projects successfully?
2. Have they delivered any previous non-crowdfund projects successfully?
^ Produced something I enjoyed or could see myself enjoying (decent reviews help)
3. Do the company leads run an efficient business already?
4. Do they have a reasonably, sound concept and maybe pre-alpha footage if its a media product (not overly ambitious)?
I remember this particular one, but I steered clear.