rocsen: Is there only one technique in combat that actually works? Maybe that's why players struggle
No, one of the strongest aspects of the combat in TW2, is that it's incredibly open-ended, and there are plenty of choices on how to come out victorious from a battle. Grasping the combat system takes time - it's a lot to learn, and I can see how that could discourage some people. This is why it comes with an 'easy' difficulty setting, however. CDPR designed 'normal' to be quite hard, as the enemies use more abilities (such as blocking). On easy, they do not block your attacks. Ever. Which makes it a much more ideal environment for players to start out, and stick to until they feel they've got the hang of all the techniques and toys available in the game. I wish more people would turn the difficulty down if they're having trouble, rather than stubbornly going at it, again and again, before finally going on forums to complain about the game.
My entire first playthrough was played on easy (without any mods installed), and I died plenty of times in the beginning, until I finally started surviving a lot better for the second half of the game all the way to the end. Some ways into my second playthrough (also on easy), I finally started feeling like I was beginning to understand what it was all about. I know, I might be a slow learner, but this still serves as a good example on how challenging the combat can be to a 'newbie.' There's no shame in dialling down the difficulty while you learn a new system, as it can save you a lot of frustration. I can now handle the game on hard with very little difficulty, and it was then that I realized that the game, in fact, feels too easy. And many others would agree, judging from the forums here and on the Nexus.
The problem is that TW2 vanilla unfortunately allows for some cheap tactics that are far superior to others, with bomb spamming and Quen-abuse being the two most prominent ones. Even without these tricks, once you have mastered the combat system, the game becomes effortless around halfway through the second act. The equipment and skill balance is out of whack, and with little to no scaling for the enemies, people start feeling disappointed. Again, this is an excellent example on how complex the combat actually is - at first, you die often on easy, but once you learn all the nooks and crannies, you hardly break a sweat on hard, and many people even start to always play on insane, and thus never die once during a full playthrough.
This is why I suggested those mods - they re-balance the difficulty, so that you no longer hit that spot halfway through the game when you start feeling like an invincible deity. They're especially great for those of you who already have wrapped your heads around the combat system, know it inside out, and have started feeling the game is too easy. Believe me, with these mods, it's like a whole new experience. It feels challenging - yet fair - from beginning to end.