I greatly prefer linear games. 
 
 When I read reviews I mentally +1 every time I see the word "linear" (regardless of the reviewer's POV) and -1 every time I see "open world". 
 
 I am playing now Shadowrun Returns, which is clearly an extreme in linearity and enjoying it a lot (would have preferred a few more battles, but that's OK). The fact that every couple of screens the plot advances cogently (not just a filler) keeps me interested and involved. 
 
 I attempted playing The Witcher three times. The prologue I rather enjoyed (it being quite linear), but once I reached the first village and was faced with a whole slew of "free-to-choose" Fedex quests, a world where I seemingly "could go anywhere", and meaningless activities such as drinking contests and pugilism (all of which I had to explore, because I'm a completionist), I lost interest. I never made it much beyond that point on all three attempts. 
 
 I attempted playing Fallout three times and every time gave up when I reached the Hub and had to click on screenfuls of people with irrelevant "colourful" dialogues. On the other hand, Fallout Tactics (with its linear sequence of ~20 battles) is one of my all-time favourite games. 
 
 For me, a game is about story-driven gameplay, first and foremost. A lot of gameplay (preferably, micromanaging at the tactical level) and a modicum of plot is the best for me. Too much "freedom" detracts from it. 
 
 Good examples on GOG are Etherlords 2, Fantasy Wars, King's Bounty: The Legend, Aarklash, Fallout Tactics, Freedom Force vs 3rd Reich. 
 Outside GOG, the SSI Goldbox, Hoshigami, Final Fantasy Tactics, Vagrant Story. 
 
 I don't play many point-and-click adventures, but for RPG and tactics games (my seitan-and-potatoes), the linearer, the better.