Resident Evil 4 was one of the first games I played in the franchise. The game had an interesting development cycle, going from a psychological paranormal type game and eventually shifting to an action horror. We also moved away from fixed cameras and tank controls for a third person shooter, though you still need to stand still in order to shoot your enemies.
Resident Evil 4 is still a classic, and has aged pretty well on both the visuals and gameplay. Despite its action approach, survival elements are still there, as you'll want to preserve your ammo and health as much as you can due to potential crowds of enemies. There's also the game's iconic cut-scenes which are known for having quick-timed events which, if unsuccessful, can result in a game over.
The story is standalone from the Resident Evil universe, which the focus on parasites rather than a virus causing the situation, but you do get returning character Leon Kennedy from Resident Evil 2 back into the mix. He offers some pretty amusing dialogue and his counters during combat is solid, for instance when an enemy is hurt in a specific way you can respond back by kicking them or even killing them. Each enemy will drop something in return, like extra ammo, health, money or special items you can use to sell to the game's merchant to buy or upgrade your weaponry.
The merchant is a new addition to the franchise, and he offers you a way to upgrade your equipment and buy new guns or health when needed. You will need to upgrade your case, as there's limited space available to begin with. Much like the earlier games, going into your equipment menu will pause the game so you can relax and carefully pick which weapon or item to use at any moment. If you feel like adding a ridiculous challenge to yourself, if you kill the merchant he won't come back for the entirety of the game so you'll want him alive to improve your combat.
The weapon selection is great, with pistols, magnum, shotgun, rifles, machine gun and the iconic rocket launcher all make a return. The knife is a super useful tool as you can use this to open up boxes for more items, and when an enemy is down you can use it to kill them to preserve your ammo.
The game is also semi-linear with some areas having you go back and forth in the area, but for the most part you will be going from point A to B. The story is also split into chapters and the typewriter returns for saving. You can return to the same area without losing too much progress thanks to the checkpoints, which will be handy for the hardest difficulty Professional (which is unlocked after finishing the game at least once).
The enemies are also great, with a variety to keep you at your toes. Alongside your usual villagers, you have the iconic chainsaw people who can instantly kill you if you're not careful, bugs who turn invisible, dogs, regenerators who can't be killed unless you find their specific weak spots using a heat sensor, and more. There's also a boulder sequence to run away from!
Included in the later releases of Resident Evil 4 are more content, and one of those is Separate Ways which is a new mini campaign focused on Ada Wong who turns up in parts of the story. Her campaign has limited equipment and re-uses a lot of areas, but her storyline does provide some missing gaps and context to the main storyline. The crossbow weapon is pretty cool too.
Overall, Resident Evil 4 is a classic and one worth playing even if the remake ends up being an improvement. The story can take about 13-14 hours and the Separate Way campaign adds another 3-4 hours. The trophy list is pretty small as it matched what Xbox 360 had with the main focus being the story and a Professional playthrough. I played the game on Normal but I have played aspects of Professional many years ago.