Q no.3 Unity is another shell and it is not included by default.You can easily install it using synaptic package manager.
Q no.4 No currently it can be made to look like old mint menu. But still you can edit the menu just right click on menu.
Unity does not come with Cinnamon, you have done something else to download it if that's what you see.
Like all shells Cinnamon has several different themes - if you don't like the default one, change it. There is a classic menu applet for Cinnamon which brings the menu a lot closer to the original Mint Menu than than the current default Cinnamon menu does, check http://cinnamon-spices.linuxmint.com/applets and go exploring.
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