As You've wrote... U have 3DGS for 4 months! It's like a talking about 300 pages book after 20 pages.

Nobody is perfect... 3DGS too... but power of this app is in:
evaluation, compatibility with other pro apps and file formats, 100% freedom to create the worlds, lots of plugins, good forum , all in one (WED, MED, SED) you need to create games... and much more

It's like a good car... maybe Acura is better one than Mercedes but try to buy spare or compatible parts
Even Bugatti Veiron or Rolce-Rolce crashes sometimes

But if You want try something out, here You have some multiple links about game engines apps
web page
web page
web page