For me it would Demon's Souls. That game is so unique and so difficult that you just have to try it. God of War 3 would be another great exclusive. Metal of Gear Solid 4 would top out my list.
I'm looking forward to watching somebody play Bloodbourne. I'm not buying a new system just to play one game. There should be a law that all games should have a PC version.
For me, my favorite console is the Super Nintendo. With games like Donkey Kong Country 1 & 2, Mega Man X, Super Metroid, Link to the Past, and Chrono Trigger how can you not select the Super Nintendo.
I would play solitaire if I don't have any money to spend. When I do have some spare cash, I would go play some table games at a casino. The thrill of winning is the funnest feeling in the world.
I played most Super Nintendo and Nintendo on an emulator. You can revisit game you played and games you wished you played in your youth. I wish they would make a PS3 emulator already.
The only game I would like to play exclusively on the PS4 is bloodbourne. If you like that game, then get a PS4. If not, I don't care for consoles and just stay with PC.
Dark Souls 1 was the most addicting game I've ever played. You can replay that game a million times and not get too bored of it. Binding of Isaac Rebirth got me hooked for a while with the replay factor.