The question is not 'is this a serious program'. If we were going strictly on program capabilities, I'd 100% say it's not.
The question, with gamedev, is 'are you a serious person?'.
The fact is that Game-Guru can make games. It has a lot of problems. These problems will have to be worked around. There are a few successful examples but mostly you are going to find it useful as a rapid prototyper.
When you actually get into the publishing phase, it's not an enterprise level tool like lumberyard or UE4. Nor can you expect it to be. It's made by one person. However:
- It costs little to start
- Assets cost little to obtain
- There's a massive store of free things on this forum and elsewhere
- Assets are easily placed/manipulated (so easy, my 7 year old has been working with it regularly since he was 5).
- It's graphics quality as of current is on peer with 2002-2005 or so (better than some indy game engines cough cough game-maker cough)
- The terrain system can make some good work if you put some time into it.
- It uses Lua reasonably well
- Lua is fairly easy
- EBE is a huge step towards functional indoor environments that are rapidly assembled (like FPSC)
- Fairly knowledgeable and close-knit community (even though some are very rightfully bitter)
So in short it's a low cost, low cost, did I mention low cost? Gamedev platform. Heck, even the most expensive asset lists on the store will give you more than you can possibly dream of in an engine in like UE and we have some pretty good artists here. They make the most of the limited engine, as do we all.
Negatives:
- Dated graphics engine (currently being upgraded to DX11 and PBR)
- Bad AI... ok let's just say it's atrocious for the zombies and bad for the rest of the stuff. I personally hope it's the next agenda item resolved.
- Inconsistencies in compiling; compiled games often don't work the same as they do in test game mode/development mode. You often have to tweak compiled games
- Awful load times for compiled work (supposedly being fixed in the next patch, praise the lord)
- 20000 poly limit on models
- The character creator has so much wasted potential it's unbelievable. Seriously guys, make some models for it!
- EBE has some bugs (notably continues to draw terrain and objects that should be occluded)
- Bugs. Bugs. Bugs. Weird issues that you have to hunt down.
- Slow pace of updates. Lee takes his time.
So.. up to you! Good hunting