tinyE: It doesn't and you make a good point HOWEVER in turn you can't just assume because a game is older that it is sub-standard or incapable of holding it's own next to newer games. I'm not intimating that's what you mean but it does kind of come off like that.
Given that most of my shelf on GOG consists of old games that I enjoy the hell out of and that I just finished rolling around on the floor with the first two Doom games, I think it is safe to say that I don't hate games because of their age. At the same time, if an outdated design choice is preserved in the name of tradition, then I have no problem pointing it out, even if it was in an old game I liked.
tinyE: As for my love of the game, to each his own and there is no good and bad, that being said I think you will find Diablo has many more people singing it's praises than not. Also, you may have noticed that since it's release all those years ago, the term "Diablo Clone" has become a permanent part of the gaming lexicon. It's almost become it's own genre. I've actually been on game sites that were divided up with Racing, RPG, Puzzle, Platformer, FPS, and Diablo Clone.
Ah, relativism, an appeal to authority, and a premise that does not bear any apparent relevance to the issue at hand, the unholy trinity of reasoning; let's take them one at a time. First off, it may be true that some aspect of enjoyment is subjective, but simply citing to there being "no such thing" as good or bad in general never ceases to irritate me; firstly, they do exist, albeit personal standards don't tend to converge on that many points, and secondly, doing so serves only to sidestep having to explain why one likes the design choice in an intelligible manner, which in turn frustrates other people trying to understand the rationale behind said preference.
Secondly, the mere fact that the majority of people like a game that has this design choice ultimately says nothing other than the game is popular. If you are attempting to insinuate that this shows that since the majority likes it, the minority are clearly wrong, then you are contradicting your first premise. If you are citing to this to show that people like the design choice and that therefore there is no reason why the design choice should not fly today, my counter is twofold. Firstly, under this logic, had gaming never evolved from where it was at the start of Evolandia, any complaints over the lack of the ability to move to the other side of the screen would be unfounded so long as there were enough people who defended it due to it being their only exposure to gaming thus far. Games have also had lives systems in the past for the purpose of trying to get as much cash pumped into machines as possible to continue playing, but now that most games are played at home and do not require the player to insert more quarters on death, lives systems are well on the way out for the most part, and the release of a game that uses one is a galling design choice regardless of how many games past used it. Secondly, I would point out the possibility that not all gamers who like the game necessarily do so due to a critical assessment that finds no problem with the design choice, but a combination of nostalgia from having played it back in the day and not having any better examples to work off of; again, if an FPS were released today without the ability to strafe, or a top down RTS that refused to allow the camera to scroll via movement of the mouse, it would get rightly savaged since it had an entire history of gaming evolution to catch up on and therefore should have known better.
As to your last sentence, I am not joking when I say that I honestly don't understand where you are going with this. "Doom clone" was the common name for any FPS back in the day, but first person gaming hasn't adhered to every single design choice that looked good back in the 90s, and has evolved in may respects since then. If there's something I'm missing in this sentence, then by all means, I'm sure that I'm not the only one who desires clarification.