It's a pretty solid Quake 2 sequel, and i'm glad to see the Quake fan base has warmed up to it over the last twenty years. It is essentially Quake's equivalent of Doom 3 in that it's slightly slower paced with more of a "horror" element than the pure action of the previous titles, but it's certainly not a bad game.

Quake 4 has not aged very well.

The levels are ugly and uninspired; the Strogg's facilities are not too dissimilar from the UAC base on Mars, but are way uglier than what you'd see in Doom 3. Navigating the levels is also a pain because of your slow moving speed and the sometimes confusing level design; not all doors are clearly marked as open or locked and there is a decent amount of backtracking. Not fun at all!

The gunplay is also boring; the guns have no punch to them and are as uninspired as the levels. The basic pistol is perhaps the worst pistol I have ever used in a video game. The enemies are either pushovers or tanks and fighting them is not fun in the least. Despite being released close in time to such classics as Half-Life 2 and F.E.A.R, there is little to no impact on your environment from your battles. Corpses disappear after a few seconds, leaving bare and boring rooms behind. It's baffling how few developers understand the importance of leaving traces after your battles behind. There are some turret sections and scripted events that are supposed to be epicsauce, but they are not interesting or fun either.

The graphics are fairly decent despite their age and the worldbuilding is nice; despite the backtracking being a hassle, they sometimes change it up by having soldiers arriving with equipment, taking care of the wounded and dead and inspecting Strogg machinery. You can also listen to them talk about stuff, which is great for immersion.

I don't recommend playing Quake 4 unless you are able to deal with boring levels and boring gunplay.

Para mi el mejor quake junto al 2