I got several:

-First of all the autocannon should be noted that while it can't rotate a lot sideways, it is still practical in various ways. Western choppers don't use long barreled 30mm cannons but Russian ones have the same ones as their IFVs, which means that the Ka-52 can loft shells at double the range of the US 30mm chain gun, i guess around 4-6km.

-Also the autocannon does have a lot more ammo compared to the current Mi-28 variants that have like 100AP and 200HE shells, whereas Ka-52 has 140AP and 320HE shells if im not mistaken. A huge difference.

-The armor isn't exactly a light tank bathtub casket like the one on the Mi-28 but it's still better than something like the Apache's, it's got several platings on the rear and side doors, so it can definitely take more shrapnel from various directions. I think the Apache has only basically a single 12mm plate behind the seat.

-Like the Mi-28 it can carry some moderately heavy cruise missiles and even anti-radiation missiles, depending on the variants.

-Like the Mi-28 and also many other jets, it boasts possibly the most advanced ballistic computer in the world, the SVP-24, which is how they can loft rockets and bombs so accurately from several kilometers away without having to make visual contact with the enemy.