*This review contains spoilers.*
I'll assume that if you're reading this, you played the main game. So I won't be going into detail about the mechanics of the game.
The Whistleblower is a prequel of sorts to the main game. But also overlapping into the main story
. In it you play Waylon, the guy who sent Miles the email about Mount Massive Asylum in the main game. Objective? Escape.
It plays exactly the same as the main game with a camcorder included, although I found myself hiding much less and doing way more running in this one. This might be due to less backtracking, mutliple levers or switches are replaced with singular objectives. Flip one lever, turn one valve ect. Backtracking does still occur though.
Some characters make a return, including Chris Walker (Big F'n Guy), The Wallrider, The Twins and Father Martin to name a few
. You'll also be going through some familiar locations as well, which makes sense. It's still the same location after all.
The "scares" are about the same as the main game. If you could handle that, you'll be fine here. However, the shock value went WAY up. Cannibalism and necrophilia, which was in the main game are taken to a whole new level here.
Like other reviewers pointed out for it's insperation, it's like New French Extremity films. Except in videogame form. One particular part in the last act is probably the most disturbing thing you'll ever see in a retail videogame. "The Groom" made my list for Top 10 antogonists in a videogame of all time. His actions and dialogue make the rest of the Variants in Outlast seem quite sane. It's like Vaas from Far Cry 3 and a splicer from Bioshock had a son, and that is the result.
I actually found myself enjoying the DLC more than the main game. If you enjoyed the main game, I highly recommend The Whistleblower. You'll love it!