You can do well on some fights if you're fed gear. But the fact of the matter is that an equally skilled rogue can out DPS a feral on almost every fight, so a guild interested in progression-oriented gearing will feed agi gear to their rogue which widens the gap between the rogue and the feral more. The streams and videos you're referencing probably have some very geared ferals topping meters, which is completely possible on some of the fights.
And even without gear, the feral can still be brought in for the mild utility we bring to the table if needed for an encounter.