The fact there are many of them doesn’t mean they are that good. First one is 59 in the ladder while many other specs have higher representation. Keeping in mind that Warrior’s utility is insanely strong and created for 2s it shows they are underwhelming.
2s were always dominated by meele specs with healing reduction because 2s start with 20% dampening.
In 3s there are also many Warriors but they are even lower.