I use Unity3D since 2013 and like all the engines out there , you have to learn how to use them of course.
My experience so far is that unity is a great tool for hobby game designer like me but not for big projects involving massive amounts of scripts.
I usually do Visual novel like games because it is much easier than fps or any other fancy things ^.^
IF you want to some smal examples what a *unexperienced hobby* programmer can do with unity here are two of my games:
Please have mercy with my english spelling + grammar.. This isn't my nativ language!
1. A Tech erotic demo with DAZ 3D chars 
Some details about the technical aspects :
- unpacked size : ~ 1 GB
- packed size : ~350 Mb
- ~ 600 VN frames (sentences)
- used Unity 3D game engine
- runs on my PC (I2600k,16GbRam,GTX 680) with about 100 fps in full HD (NO SSAA) 60-70fps (with SSAA)
- grammar and Spelling errors all over the place.. not a native in this language

Known bugs :
- SSAA cost performance.. srsly.. (not realyl bug but i better mention this)
- the higher you set the SSAA value the smaller the GUI will become.
- I think the breasts from Lisette are a bit too bouncy.
DOWNLOAD LINK : https://mega.nz/#!QV1RnKrL!6NR8kTlfphaFEA8GavFwGmmZlsHlxjAitUB42x8ojs82. A Fetisch erotic demo with monstergirls (MMD chars) .
Story Frames : ~2200
Size: ~ 900 Mb (Raw)
Controls :
W-A-S-D : As usual
Spacebar : jump
E - use
Left shift - run
F1 - Toggle help screen & questtext
F2 - Toggle auto text
F3 - Open spellcheck window
ESC - Open menu
You have now 4 quicksave slots and 4 regular save slots
F5 - F8 - Quicksave
F9 - F12 - Quickload
DOWNLOAD LINK : https://mega.co.nz/#!wYckmZbK!sx3DGRft1O6vID_-Zfc4Kllns-jFUPEMJKdkXSx1kW0MY website (for those who want to know) :
http://3dnovels.de (warning ! written in flash since i am not good in PHP,CSS,HTML script)