Its a bad game, being better then other bad games does not make it good.
It's fine if you don't like it, but if you can't even articulate why you don't then why are you even posting? Forums are for discussing things, so what the fuck am I supposed to take from that?
As for it being relatively good you need to establish some sort of grading, a hierarchy, to be able to say anything about it in the first place, as well as reference points for comparison. It's also useful to take into account what people were saying and thinking back then. When Doom 3 came out people complained endlessly that it was a slow plodding shooter that thought itself a survival horror game but wasn't, Quake 4 by comparison is much more in line with older id Software titles, throwing more enemies at you at a quicker pace, and letting you move around quicker, especially with the cyborg legs.
At the time Quake 4 was considered a big throwback, and it was, but these days the issue people have with the game is that of theming, with the popular opinion and drone consensus being that Quake 1, a game that was thrown together from scrap parts and didn't make much coherent sense, is the peak of 90's mood, probably by kids that weren't even alive then, and Quake 2 sucked. Ironically these same people tend to love it when modders turn Doom from the abstract designs purely focused on good level design it had into something aiming for realism or aping cinematic console shooters.
This is all important to keep in consideration when you evaluate the reception it got at the time, and why people are so against it now. Back then it was because we were transitioning into console shooters and there was no place for the Quake series anymore, just as multiplayer Arena shooters aren't competitive in the market of today. Call of Duty 2, Halo, all that slop. Now it is because of this new manufactured and artificial idea of what a "boomer shooter" is that is being pushed by some people to sell crap games. A supposed return to fundamentals, but badly understood ones.
This is what IGN said at the time:
It's a curious direction that Quake 4 has taken this time around, with the heavy emphasis on single-player, apparently at the development cost of multiplayer, previously its very selling point. And while the SP production values are certainly expensive-looking and sounding, the actual combat mechanics feel a step behind the evolution of the genre, and not in an intentionally retro way.
So if you're into older shooters, and certainly a
Monolith-is-number-one guy like me, at the time it was the okay sequel to Quake 2, overshadowed by F.E.A.R. which is the peak of spectacle shooters, but not nearly as bad as the console slop that dominated the market. I'd agree that it lacked the raw 90's energy that almost all shooters had lost at that point, but if you're going to compare everything to the best the genre has to offer, and say everything below that bar is bad, then you're going to be calling all games but those shit. I could be calling all games that aren't Blood shit simply because they aren't Blood, but that's not very interesting nor a very useful way of spending my time.
Quake 4 was doing something most stopped doing as the age of console shit dawned, and for that reason I'd say it is underrated. Especially in light of what issues people had with Doom 3. Raven never had the best of level designers and they never had a finely tuned sense of what made shooters satisfying, the small details, but they did an okay job, as they always did. I already said what I thought was wrong with it but it's not enough to turn it into a terrible game. Feel free to argue otherwise, if you have any arguments that is.