Do you do everything in an open world/non linear game?

If I like the game, then sure. I can do miscellaneous stuff for a few hours. Maybe not every little thing, but I do what I can without putting in too much effort.

It really depends on the game, with past GTA games I went after all of the hidden packages but in 5 I've not gone looking for all of the car parts or even the peyote. In games like Skyrim and Dragon Age Inquisition I'd go straight for all of the story missions and concentrate on side quests only. I even found with Shadow of Mordor that I was skipping story missions and only hunting Orcs, I'm sure the story was good but the nemesis system was the real draw. When it comes to most games it's the collectibles and side quests I go for first, they don't have to have a story behind them, I just like the exploration side of it. There could be some kind of OCD behind it too, I remember with Fallout 3 and 4 I went everywhere and looted every single thing I could, collectibles feel very similar.

It was not. It's really bad and the final boss is probably the worst ever.

Did you play it on 360 or PS3?

PC. I meant the story not the nemesis system, which he said he's "sure the story is good".

Shadow of Mordor on PS4, the Orc targets changed so frequently it made going after them all over again worthwhile. The side missions to get runes and upgrades were useful too.