Now this is my (huge) opinion on Quake, which you all probably know because, well it's pretty Doom's 3D successor.
Anyway, I'll start with the bad. First of all, my biggest complaint, the difficulty. The game is pretty easy. Easy and normal are expected to be, but hard and nightmare could've been harder. Take nightmare for example. In Doom, enemies respawn, attack faster, some move faster, and is stuck on Ultra-Violence. In Quake, enemies shoot faster and is stuck on hard. That's pretty much it. Most enemies have weak attacks and health!
It's too Doom-like. I know, it's based off Doom, and i made by the same company, but still, the weapons are similar, like the "super nail gun", it shoots 2 nails at once, and fires really fast, with multiple barrels, just like the chaingun.
You start off with the shotgun. This is a pretty bad choice. Many games, including Doom, will make the shotgun your next gun, but because it's your first choice in Doom, it's pretty bad. It also shoots as fast as the Doom pistol, and doesn't even finish it's cocking sound!
Ogres drop rockets. That's not a good idea, as the explosive weapons are one of the most powerful, and ogres are some of the most common enemies! I've only ran out of rockets ONCE.
Enemies are easy. Take the shambler for example. It the strongest enemy in the game, yet it has about half the health of the Cyberdemon in Doom! It's attack is very powerful, but is usually easy to dodge, as long as there's cover.
Now, I've bashed the game with very minor complaints. But, the game has many advantages to it:
Despite what I said earlier, the guns are still pretty good. I like the nail gun, as it adds another auto weapon to your arsenal, and the grenade launcher, because it's pretty cool, and the physics are actually pretty good.
The 3D engine. You know what that mean: more possibilities! Floor-over-floor, 3D models, more architecture designs to do. This really gave mapper more possibilities to put in their maps, like flying platforms.
Traps. Traps are cool, some are hidden, and some are obvious, like the nail shooters.
The enemies. Also despite before, the enemies are pretty cool too, but they could be MUCH better. The zombies are cool, as they throw their own guts at you, and have to be gibbed to die. Some more original choices here.
It's multiplayer. Probably the most popular part of the game. I love how fast paced it is, and not to mention, it spawned the Team Fortress franchise!
Now, one thing that I don't like is the community. It's not bad (not at all), but it's pretty quite. Try looking for a TF server. That's REALLY hard. When I look for server for Quake, usually only one or two FFA servers. I usually have to search for IP addresses.
Anyway, Quake is a fun game nonetheless, but could have been really improved. Although, it's an exception, as the graphics at the time were amazing, and computers had to work hard to play this game.
SO, what are your opinions?