I don't need to install an alternative shell. I've got one that works just fine out of the box. It's called the Windows 7 UI.
FWIW, it's not the start menu I'm bothered about. Since Win7 I hardly use it anyway, I just have my regular applications set out in the task bar and use jump lists probably 90% of the time I load one. This gets me to anything from a spreadsheet I worked with recently to a shell on a remote server I use regularly with two clicks and is one of the cleanest UI set-ups I've ever seen in an OS GUI.
The thing that annoys me about the Win8+ GUIs is how dumbed down and in-your-face they are. Huge areas of bright colours (yay for eye strain), boxy styles where you never quite know what you can click (sorry, tap) until you try, clumsy icons that don't really tell you anything anyway, and everything all spaced out so fat-fingered people with tablets don't accidentally reformat their disk instead of sending an e-mail. For someone using a keyboard and mouse with good screen(s), all of this is moving backwards. If I wanted dumb UIs for simple stuff, I'd buy an iPad and use web apps instead of desktop applications.
I do realise that some of this related primarily to what was then called the Metro UI in Win8 and some changes have been made since then. But from what I can see so far with Win10, it looks like they're pushing the overall UI theme even more in that direction, even if the default method of interaction looks more like a traditional desktop again.