could you give any merit to the series?
Well, I actually can't give it since I found the game boring after two playthroughs :-)
That's the response I wanted to prompt. This is mostly a matter of you simply not liking GoW more than anything I'd say. You find it boring, end off. Doesn't seem you want to look any further into matters of tech.
All this talk of depth is actually irrelevant to your real understanding, because it ultimately comes down to whether you even like it or not, in this case you simply don't. Your argument is actually mostly subjective, most of your comments can be thrown at every action game ever, especially the ones you've mentioned.
Out of interest, what entries have you played? how many times? what handicaps? and what difficulties?
Though, after them, you learn how to play and the game is over. In other games, like DMC, when you learn how to play the game you actually start loving it even more and you want to play it more times and try different things.
You can play different, pick a different weapon, do a PAIN run and such. GoW 3 has 4 different weapons to use, all of them being a remix of sorts of the standard blades of chaos move set, some specializing in different fields, GoW 1 has blade of artemis, GoW2 has the hammer and spear weapons, use those instead. ofcourse,You just don't care to.
You just don't want to try anything different in what GoW allows, the game is just over for you, fair enough. And when you say 'you' here, i think you mean i, as your speaking for yourself here i presume.
I should think you know better than to dismiss a game purely by its simplicity, despite souls still being some of the most basic as you can get, yet you like them quite a lot sir. Despite there is nothing to the series combat once you've mastered each enemy and bosses move set, just pick a weapon and time just one of its attacks well and that's it, nothing else new to learn. Along with little to no hit states to manipulate or various move purposes beyond just raw damage. Whether you like it or not is purely preference, this is basic fact, don't be a hypocrite. You could say the same for any game about optimization over variety and style. This applies to NG series also, especially goes for Shinobi and Chaos Legion, once you learn the game its over. Or so goes the saying "learn the game" as opposed to "be the game"(is that right Roy?).
This extends to Shmups also, lets say Radient Silvergun, for how complex the weapon system seems its purely a matter of using the optimal weapon on a given enemy and leveling up the right weapons, just as Ikaruga is a matter of switching to the optimal color polarity. Along with memorising and avoiding enemy patterns, which are ultimately predictable as patterns tend to be, especially in shmups.
In Souls, picking a different weapon doesn't equal depth, that's breadth, as your interactions with those weapons and enemies isn't any more complex. In all of souls your moves tend to do one thing: hit the thing, or hit it harder. Souls in the ways of move purposes and few hit states to compliment that, no real launchers, sweeps, juggles, approaching moves etc to speak of. GoW also has plenty of move-purposes, hit states and setups, that's why you have launchers, juggles and knockdown moves to knock enemies out of bounds for instance. Souls have actually nothing by comparison, just by how they are designed. GoW has and always will beat souls in the tech department. Souls don't even have things like cancels outside of DS2, so that cant even be compared. Note that much of GoW tech is unique to the series and can't be directly compared to others, like grabs, which outside of Nero lacks direct parallels. GoW 3 even adds new types of grabs like the shoulder charge and a move to pull kratos towards and to hurt/stun/knockdown foes. Even in early combat encounters GoW has more going on than Souls, the game demands you learn more than bait n punish tactics.
You've been weighed, measured and found wanting sir, the facts are against you. Your preference if you like it or not, that's no issue by me, but to deny its quality, tech and certainly suggesting to others to not play it if they are fans of the genre or not is a blatant disservice to the series, genre and its fans. Just don't use the excuse of the series not being as deep as others in the genre as one to dismiss it, otherwise you might as well stop playing souls right now. Just because its not as complex as others doesn't discredit its quality in any way. It being so accessible is only worth giving credit for, given how complex these games can get with little in the ways of tutorials, GoW makes sense even on a first casual outing, especially when compared to say God Hand. That game tells you little to nothing and expects you to have an advanced grasp by mister gold/silver boss*just brutal and ruthless*. GoW being targeted primarily at the masses doesn't detract from how much the series has to offer to the genre. Same goes Knack 2, even more so what is supposed to be a casual baby game(doubt you'll like this either).
The very notion that BigZee has a seemingly eldritch amounts of wisdom for the series speaks volumes about its nuance, i highly doubt he's bluffing. I learnt plenty from Roy's GoW1 runs and BigZee's analysis in the comments, supposed tech or not. I say all this and i'm not that much of a fan of the series, i don't like GoW1 that much even if i respect it immensely, 2 is bar far the best but i really like 3 for some reason, i think its the art, weapons and grab option additions/changes.