I love Fallout 4. I'm enjoying more than New Vegas and Skyrim. I love to just go off and do my own thing. And I really like the companion likability system. It really makes you think about who to bring along. Do send I them away when I do mean things or in my case send Cait away when I'm being nice.
And after I got used to the new Perk system and started focusing I really like it more than the old one. But I think my favorite new thing are the Legendary Mobs. More specifically the Legendary loot they drop. I got an Explosive Combat Shotgun off a Mirelurk.