Can't say I disagree. How do you know so much about the game if you haven't played it?
I do a lot of research. Before I even played Ninja Gaiden, I watched a commentated Master Ninja walkthrough of Ninja Gaiden 2 Sigma so I learned a lot of exploits and terms related to Ninja Gaiden and other games like I-frames (invincibility frames) and UTs (Ultimate Techniques) or how you can loop Genshin with the Lunar Staff, the Kusari-Gama's grabs being really effective on certain enemies, Tonfas being capable of dismembering Werewolves quickly, and how Enma's Fang make quick work of the Ice Dragon through it's UT. I also found out how UTs basically break the game and how they're essential on harder difficulties like Master Ninja mode. That said, it's like taking the easy way out, or making Master Ninja less frustrating. So, when I actually played it, I was more prepared than a complete newcomer to the series. That still, didn't make it any easier since while I know things about the game, I don't actually have any experience with the game. Same goes to everything else.
Anyway, I tend to do stuff like this when it comes to things I might not get a chance to play or feel apprehensive with like Ninja Gaiden and Demon's Souls, which by the way is not a difficult game, it's a game that punishes recklessness. Playing cautiously in Demon's Souls takes the frustration and difficulty way down. Games like Halo, Alan Wake, or even games like Resistance, Killzone, and Heavy Rain, I still look into even if I might never play it. For one, I might find the concept interesting like Halo, Resistance, and Alan Wake. The other reason is the story like Heavy Rain which is kind of a movie except with QTEs which I hate. Or I just want to know a bit more about it, like Killzone, and understand why people like it. I don't like Killzone or God of War, but I'm not going to rip on them because others like them and if I do, I'll point out things I don't like from playing them or seeing them in action. The whole weightiness in older Killzones and God of War's QTEs along with its rage against everything are things I don't particularly like about them. Fire Emblem, Persona, Shin Megami Tensei, Final Fantasy, and other RPGs are games I will usually look into so I can have a better grasp with their mechanics since some of them explain their mechanics poorly or don't at all. I would have never realized Sazh deals so much damage with Blitz in FFXIII if I didn't look it up or that Fire Emblem: Awakening can become a super-soldier breeding simulator.
Cars, computers, music, whatever, I'll usually research stuff about them. Before learning how to drive a manual, I looked up everything I could so it made learning much easier since I understood the mechanics of manual transmissions. Still, that didn't mean I could hop in and start racing like professionals. That sort of built up into developing an interest in automobiles and motorcycles. Computers started from wanting a better computer, to seeing how pre-built computers adds labor and brand costs - somewhere along the lines of about $200 on the actual cost of the PC -, and to learning how to build computers along with having some basic understanding of differences between graphics cards, processors, reference/non-reference GPUs, sales, etc.
Anyway, DmC: Devil May Cry was more of a special case of wanting to see Ninja Theory's work on it. After seeing video after video of combat, environment, and acting; playing the demo, and seeing people do crazy combos and the end product, I saw a great game made by a dedicated developer. I couldn't justify the unnecessary hatred of it - trolls, really angry, vocal fans, and whatnot -, but I always understood people's opinion on it. So, I ended up with some knowledge on the game despite only playing through the demo about three times.