Recs.
Updated
SpecsUpdate
Pros
Pro Active and helpful community
Users share ideas, help, and advice through the official forums. The community also provides a wealth of free assets, and the GameGuru Assets Store sees constant additions.
Pro Massive community of users
The gamer creator forums have a large number of users, developing games, making models for sale and to give away for other users. They answer questions, help each other with problems in their games, and can make using this software so much more fun and easy.
Pro Building editor
Currently in development but already looking very good! Easily create big and customized buildings with default building blocks and share them with others.
Also very easy to use in the designer: The buildings are treated like entities but still directly available in the 'building editor mode'.
Pro Feature priorities are chosen by the community
The Game Creators team frequent the forums and ask the community for feeback and suggestions both there and via an open poll on the website. They have a great history of reading suggestions, viewing screenshots, and generally working with the community.
Cons
Con Lack of user-interface
Although you can customize a lot, the user-interface does not show that. But plans are in place to improve this with some front facing GUI into the LUA scripts so you don't need to code as much.
Recommendations
Comments
Out of Date Pros + Cons
Con Currently in beta
FPSCR is currently a beta product with features potentially important to a specific project still in the roadmap. Obviously this is expected of a beta product, and new features are constantly being added, but should be taken into consideration when choosing a game engine for a game right now. To see what's currently implemented, being implemented and in the roadmap go here.
Con Limited to one genre
If you are looking for general-use game making software, steer clear of it. Although there are plans to branch out, they're quite a long way off
Con Can only do OUTDOOR games (as 22/10/2014) early beta version
No customizable buildings, doors, elevators, switches.. can't make holes in terrain, caves, underground structures. The outdoor is limited too: can't do rivers, caves, no atmospheric effects like wind, snow, rain, snowstorm, windstorm, sandstorm, rainstorm.
only one basic water plane.