If you get overhyped for anything chances are you're going to be thoroughly disappointed and there is no one to blame but yourself it that case. If you also go in the game expecting certain things that were never mentioned as being in the game then that is also your fault, you should only ever expect what is on the store page or confirmed by the developers to be in game.

To be honest most of the time when people are disappointed with a game it seems to be because they expected something way more or way different than what they got, that isn't the developers fault unless they lead people on into expecting certain things at release.

If you keep your hype in check and keep your expectations low you'll likely find most games you buy are better than expected. Also if you're someone who gets easily frustrated by the simplest of bugs you should never buy a game at release, especially if you're playing it on the PC.