I don't mean to be picking arguments, but I thought I would try to respond to thraxas in the best way possible.
Quote: "You should check out some of the showcase board games if you think nothing can be made in FPSC!"
I do relaize that great games have been made with FPS Creator. For example, all of the BOTB games are great to play, a lot of fun.
Quote: "Also, I see nowhere in the original post where mention is made if making a commercial game. You know what they say about making assumptions."
Without any information in the first post as to what the OP really wants to do, I thought I would provide a perspective of each.
And now my final recomendation;
Jojoofu; go to the showcase board, download a few, and see what you think. First, I would download a relatively new showcase game, as it is likely the 'average representation' of what people can do in the engine. Then move on to a BOTB title (Best of the Best), and give one of those a play. Someone with a BOTB title likely means that they have pushes FPSC to its limits in one regard, be it polygons in scene, voice acting, puzzling levels, etc.
Once you see the kind of product that FPSC can create, then it might help you make your decision, as you can see what a final product would be like.