From my perspective, I have tried fps creator when it was originally released, a year or 2 in and now. It has vastly improved. For one PC's have come along a fair bit and so can run the native DB code a lot faster than at time of release. Secondly FPS Creator has improved alongside DB Pro, which I have used since release, again making it way better as time has progressed. Thirdly, you need to check out some peoples creations. I have played a demo of Doom 3 which was fairly stunning considering its FPS origins. It ran a little slow at the time, but I am convinced it would run at pretty much full speed now on modern systems. Looked for a download recently to try on my system, but it seems they are dead

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In my opinion, and that's why I just bought this product (again), lol, just got the bonanza package. FPS Creator makes a great First Person Adventure engine. Or at least I hope it will (not got into scripting yet).
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