We can see
* flying combatlog with attack number. Already available in WoW
*damage numbers. Already available in WoW and all MMOs as part of the default UI. Are you [censored] serious about this ?!
*what skills the opponent is using. Already available in WoW, it's called Gladiatorlossa
*INTERRUPTION WARNINGS. There is no mod needed for this, the cast times on such abilities are so long that only a complete [censored] wouldn't interrupt it in time.
*Buff timers. Available in WoW as part of the default UI.
*Debuff timers. Same as above.
*what armor stats the oppenen has. Not enough info to pass judgment.
*dps meter. Mandatory addon for all purposes, it's available in wow, it's called Recount.
I'm not seeing anything gamebreaking just doom and gloom from someone who obviously never played WoW or any AAA MMO. Art thou mad, sibling dearest ?