Moved from another forum section:
BioWare,
If addon support is not a top priority at the moment, please at least develop an in-game DPS and healing meters as soon as possible. When most guilds start raiding in January, this information will be very important in deciding who is doing their job and who is slacking.
The DPS/Healing meters can be very basic and just include the persons overall damage or healing per second and no further breakdown and display of the information is needed at this time.
Considering it should take one of your developers about 2 hours to simply create the box, make the user clients display the damage done to the mob by what player and in what amount of time, this is a fairly small request and it will make a very big game impact to raiders.
To the forum users: even though there is no combat log, the clients are still receiving updates as to what character is using what abilities and how much damage is being done, its just a matter of dividing that number by time in combat and displaying it.