If you're completely uninterested in any offerings from the Windows app store, then Microsoft have heard our cries and made them... OPTIONAL! Yes that's right!
For each tile that's been annoyingly preinstalled, you can remove unpin them from the start menu or even uninstall them until you get a nice clean start menu.
To hide or remove them, right click on each tile until satisfied. There will be some apps that you can't uninstall (such as PC settings), so you'll have to make do with using "Unpin from Start".
Oh sweet simplicity has never been so sexy!