This is a list based on each class on what your damage tells you. Feel free to create your own list or just comment below.
Striker
1. 5k - if you are just starting out that's OK.
2. 10k you're starting to learn the game
3. 15k congrats you are now a average player!
4. 20k you are a little bit above average if you get this often
5. 25k you pro bruh
6. 30k calm down
Guardian
1. 5k should use your shield a little bit more.
2. 10k if you get this your a little bit below average
3. 15k above the average guardian
4. 20k dude, you're awesome
5. 25k teach me senpai
6. 30k O_O
Recon
1. 5k try and use a heavy wepons
2. 10k showing improvement, stay alive longer
3. 15k nice footwork, keep it up
4. 20k looks like someone had been spamming
5. 25k turn off AT you noob
6. 30k no man's land ☆_☆
Guardian and 69k.