Well you know what looks fun based on previous experiences with a similar game. Sure its not always clear, so you have to take a chance, but the intention when buying a game is to enjoy it and beat it. If its not fun, then you stop playing it. Buying a game just to see if you like it makes no sense. You buy it, play it for 2 hours, you love it and then stop playing it because you bought it ONLY to see if you would enjoy it. Thats just weird.

Again: I try to gauge if it will be fun, but nobody can tell me that works. It is probably a point of expectation. A game that works and is polished... but bland - that is not a game I will finish. And a lot of AAA games are exactly that: include a lot of stuff that is great on paper, have good graphics, work as intended - but don't grip me. Marketing obviously paint a different picture. And you can't tell me it is different for you. There is an old saying, that 90% of everything is crap. Which is true, because we scale our expectations with the best. People these days still read Lord of the Rings from Tolkien, but thousands of other authors that wrote at the same time are forgotten, because they were not as good. The only difference today is that you often are still caught in hype. So with trying to pick you poison you may avoid 50% of the mediocre crap, or even 90%. That still means half of the games you play are crap. People get often bamboozled by pretty graphics or big worlds or whatever, but I am an old gamer who plays for some time, and I can often have more fun with older experiences with shitty graphics and less content. Because the core of the game is fun.

EDIT: And more importantly for this topic: A game can be actually fun for 10 hours or 20, but not the 50 or 100 it is made for. Many games start off fun, but turn repetetive. I often don't care too much about their story. I messed around many hours in Skyrim for example, but never finished it. It is fine, because at some point the gameplay gets repetetive and the story is, well, I don't actually remember much so impressive was. Something about dragons and Fus Ro Da. I wouldn't say Skyrim was crap, it actually was fun. Just not till the end. So why would I keep at it?

How the hell did you beat the second boss? That shit is insane but the fact that you only get 1 attempt every 45 minutes or so makes in mind-boggling difficult to learn what's going on. Imagine getting to the end boss and only having an attempt every 3 hours. That's beyond the pale of what could be asked of the gamer and it's a pity too cause the game is so good. It would make the game so much better if you got a chest at the start of new biomes that geared you out decently. These games only work because of permanent progression but that is almost nonnexistant in this game. 

Can't remember, this was around 6 months ago lol, I was quite strong and had a lot of upgrades though

Im not sure what you are arguing at this point. You buy a game in hopes that its good, that you will enjoy it to the end and beat it.(Unless its a game without an end of course like multiplayer games and MMOs.)

If you are buying games and play it for a bit just to see if they are fun or not, then I cant relate to that.

I play games to enjoy them and that means that I complete them. Usually it involves a story arc that I want to see through. I'm pretty good at knowing what I like and sometimes I watch gameplay videos beforehand, so I rarely miss. But if that happens, I will know very early on and will stop playing.

The aim is to complete the campaign for most games.
Will I? That depends on the difficulty and overall enjoyment I'm having.

Well, obviously I buy a game in the hopes that it is fun. But that just doens't work out every time. More importantly, you put "you will enjoy it" and follow it with "to the end and beat it". I can enjoy a game for a few hours and jump off when it starts to get repetetive. Nothing wrong with that.  There is no obligation wade through another 80 hours that start to dredge, only because the first 20 hours were a lot of fun.

I played Assassin's Creed 3 and did not care for the story (can't even tell anymore what it was about), but I had fun to build up the village for some time. I skipped some games because quite frankly the AssCreed games came too often, but I did pick up Odyssey, because I love ancient greek myths. And I really enjoyed Odyssey, I loved the setting, I loved how sunny and good looking it was, I loved the ship including the fighting, I loved a lot of the Assassin stuff like infiltrating forts. But I unlocked some regions and realized the map has a lot more of them which probably all are the same in content, only wiht higher level enemies. Also I hated these stupid battles. They were absolutely unfun. So I jumped off afgter about 15 hours or so. Which was fine, because I had fun till that and had I forced myself to play it to the end I would probably have ended up hating it because I had to keep doing the same shit over and over. The story didn't engage me enough to keep me.

But the devs were obviously so interested in the setting, they made another game: Immortals Fenyx Rising. Which took the myths and made them into a world. The game was smaller than AssCreed to begin with. The regions had more differences because they weren't bound as much by realism. The added gameplay elements for battle and movement involved more unrealistic stuff - which was a lot of fun. They involved puzzles which I generally liked. So gameplay offered enough variety to soften the repetetive nature and it was shorter to begin with. In addition it had a really fun story I wanted to progress, so I finished this game while I did not so with AssCreed.

I really, really don't see why people force themself to finish the games, especially since they getting so overly long with so much repetition, only because they paid for it.

To me, "beating the game" is often irrelevant.  The journey is the important part, not necessarily the destination.

Wrath of the Righteous is one of my favorite games.  When i first bought it, I put hundreds of hours into it and restarted many times.  I played it for a very long time without ever beating it during that initial run because I was having fun using different builds.  It didn't matter if I beat the final boss or not because it's not a competition.  The only important part is that I'm enjoying the experience.

You do gaming wrong! You don't game to mess around and have fun, it is serious business, it is your job. You finish the task that is set before you, or else...