As there seem to be new practice here, let's make this completely clear:
The below represents my personal subjective opinion. If you don't feel as I do and want to counter the arguments I have stated, please do so. You are allowed to think differently, I will not take it negatively or as an insult if you have an opposing view. You have right to present another opinion and I promise I will not hold it against you.
I like the simplicity of the Start Menu in 10. It's fast to use, both with mouse and keyboard, and it gets the job done. It does what it is designed to do, is effortless and easy to use.
Win key and start typing, I can find anything on my computer or on the Interwebs. If I know the name of the executable and feel that Cortana is a bit slow sometimes, Win + R + name of the executable launches any program on my system.
All in all, Start & integrated Cortana makes the use of Windows 10 really easy.