Pretty simple, and for those of you who have been around the blocks, I'm sure you've come across threads like this before.

Here's how it goes:
• Say a show you watched, or manga you read.
• Say what you expected it to be like, usually relating to other shows / manga as comparisons
• Say what you got. Simple, easy, and entertaining.

Example:
What I watched: Neon Genesis Evangelion
What I expected: A sci-fi mech anime with rich characters, deep plot with symbolism, and psychological issues
What I got: all of the above, yet the entirety of the cast is infuriating and unlikeable to the point of a LOT.

or you can make an image like this: