DoT's at the moment are nearly invisible. With all the flashy animations and numbers on screen they get lost and we have no idea what they are hitting for. If it weren't for the icon on the monster, we wouldn't know they were there at all.

DoTs don't "feel" like a lot of damage. This could be fixed if they were displayed as floating combat text. The DoT damage would appear in big white letters and float upwards just like the rest of our damage, DoTs can crit too so this would be seen as well. This option would be for your own personal DoT's not the party or raid.

Here is an example from GW2, DoT's are displayed as floating combat text and it actually "feels" powerful and a great amount of damage: https://youtu.be/vDATKgI10mg?t=1m23s