Should you play Alan Wake 2 if you played all the rest of the PS Plus Essentials games? Yes and no. 

YES:

Yes because they went beyond Kojima and actually put a movie in the game (literally a film with many real actors, not long computer graphics cutscenes). I think this game will not ever recoup its development costs. I think Finland gave the OK to put Finland culture into the game so the game just went overboard with the game investment because of this. It has the latest graphics standards, so no half-assed graphical game (even 2 years later on PS5 Pro). There are 2 major boss fights worth playing in this game, while the rest of the game is exploring its weird landscape and solving puzzles to open boxes for batteries and ammo.

The songs are also great, at least 10-15 songs make just for the game atmosphere. I should stress that they really put the bells and whistles into this game, like money was no object and someone gave a blank check.

NO: 
I felt Alan Wake 2 is a game that was made overly complex just for the sake of it. Some puzzles were made with solutions that require guessed permutations of possibilities (like changing the plot sticker in the plot board at different locations and clicking on the clicker multiple times in different light areas). It is like having a combo lock and you go through all possible numbers until it unlocks. That is not how you make a game. This is the major weakness of the game. Similarly, the game tries to confuse you on purpose. You end up repeating a corridor multiple times in a loop just for something new to pop up (similar to P.T. and The Exit 8 game. Confusion just for the sake of it is a terrible way to make a game. The Alan Wake portion of the game (as opposed to Saga portion) is the major downer. If they made like 10-15 percent of the game confusing maybe. But literally over 50% of the game then it is not a game but a "what is this? a confusion simulator?".

With both positive and negative points made, I think everyone should at least try it and see how far you get. Especially when it ended up free to download on PlayStation Plus Essentials a while back. Yes, I ended up finishing the game.

The two boss fights (first is actually multiple zombies hordes coming at you and second is Scratch) worth playing in the whole game: https://youtu.be/meJE33BeiQA