You will not top any chart, but you can prevent wipes by making the right decisions (even if this means healing in a Feral spec). As a Feral Druid, you have to fill the gaps. If you can do anything, do it - this is the only way. This 3% Critical Chance buff offsets Feral's sub-par performance to some extent, at least. On top of that, he brings Leader of the Pack to the table. Beside great flexibility, Feral Druid provides his Raid with very solid utilities, like Rebirth - the only "real" Combat Resurrection of Classic) and Innervate - one of the best mana regeneration cooldowns in the game. This forces Him to embrace His greatest strength - flexibility. if he tries to specialize in a single role, he will be outclassed by all single-purpose Classes and will not find a spot in any Raid. Because of this, Druid in a difficult spot.
You can find all our Pocket Guides for other WoW Classic Classes builds right here: Best WoW Classic Builds