This stuff about tactics having a weird aggro list, and about people wiping bringing two groups with two pets and the pets not being able to keep aggro demonstrate a fundamental misunderstanding about how aggro works with charmed pets. It has nothing to do with the clerics getting too much healing aggro, or there being anything special about the plane of Tactics.
Quite simply, if there are more than 4 people/pets on a mob's aggro list, the mob WILL NOT attack a charmed pet. So: Two clerics + enchanter + charmed pet = 4. Pet generates tons of aggro, mob stays on pet. Two Clerics + Enchanter + charmed pet + AM3 Ranger = 5. Pet still generates tons of aggro, but the mob is no longer "allowed" to attack it, so he goes for the clerics instead.
This change was made to prevent charmed pets from tanking for raids. As evidenced here, it didn't really do the job.


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