People who know the actual damage numbers of weapons and have played for a very long time get the feeling for how much damage they've dealt, so this isn't for you.
For new players though, I recommend floating damage text. Any time you first damage an enemy and for 3 seconds afterwards all your damage done to that target adds up in to a number. After 3 seconds from the first hit that number starts to flat upwards and a new number will appear if you do additional damage. This will let players get a good feel for how much damage they're doing over time.
I really think MWO could benefit from this. MWO desperately needs more playability updates, and the ability to visually see just how much damage you're dealing is a big deal for many players.
I know people that play this game, especially those on the forums, generally hate anything that makes this game more open and easy to play and are filled with rage at the thought of anyone new playing mechwarrior, but ... well I guess that says it all.
Edited by hashinshin, 15 February 2013 - 09:58 PM.