Let me paint you a picture.
You load the app, hoping to have a cool fortnite gun app in which you can see your favorite (and not so favorite) guns and weapons in fortnite in action. To see the guns move and shoot like they do in the game. Like the other "Gun" apps available but fortnite themed.
You load up the app to be welcomed by the gate's guard. The first ad. A little unexpected but he's cool and let's you through in 5 seconds.
Cool!
Choose your weapon.
Sweet.
Select Legendary SCAR, cause who doesn't like a good SCAR right? (Maybe except Harry Potter!) 
You're greeted by the family dog. The second ad. Now it's getting worse, especially with the constant woofs and barking sounds but you bear through it.
Then you get a picture of a SCAR.
OKAY!
Then you tap shoot.
BOOM BAM POW!
It's an audio recording of the gun being shot.
OH! And don't expect high quality gun shots either. Don't want to make it too OP now!
So if the first experience of Fortnite gun shots at a poor quality of 192 kbps wasn't enough to satisfy your hunger, you have to have a chat with your weird but kinda hot in a weird way, incestuous second cousin before you can choose another gun (your third ad) Then be greeted by your Grandmother's arsehole, telling it's story of it's first condom it's had, made during the first world war out of sticky tape and peanut butter jar labels.

5/5 a true rollercoaster of emotions.
Gave it a 1/5 cause the app pic is purple, when gold is clearly superior.