The Windows 10 start menu isn't as good as the Vista/7 one. It's less customizable, stuff just gets dumped into one big list that's sorted (kind of) alphabetical. You can pin stuff as favorites, but it's horribly space inefficient. Most of those shortcuts are tiles, with few of them benefiting from actually being tiles. And your choice is either only a small number of pinned items, or making it huge to the point it is practically the start screen we got with Windows 8. Oh, and the search feature is nearly useless, though I suppose that's more of an implementation problem than a design problem.
I suppose in its defense, the right click menu with the start button is a nice addition. And I guess the shutdown functionality is better than the stupidity that was in Vista/7.
Of course, you've also got the non-Windows options. The XFCE "whisker menu", which actually has a lot in common with the Windows Vista/7 start menu, is also pretty good.