For testing purposes I tried this out.
I was sedna, and it was in a 3v3 human game, where towards the end 2 on each team had dropped.
I figured sedna could probably do the best with minions given her health buff, HPS aura, heal, and her yetis having AoE.
So I only put 1 point in pounce, 4 in heal, maxed yeti's, maxed the cooldown/minion passive, 2 in silence.
I got 4 items which buffed minion health and damage out of 7 of them. (I even spent 10k on god plate!
)
Yetis had 2085 health. My other minions where really high too.
The result? My yeti's and minotaurs would get insta-killed by 4 giants slamming at once. They where worthless. Sure, I can retreat them away from giants slam, but then I'm basically not using them.
I knew this would be bad just thinking about it. The +minion buffing items are just CRAPPY. And giants are so good.
Not to mention, when both teams get giants, the game can really sort of stalemate. I was handily winning until the other team got giants.
However, this game lasted 48 minutes. Every other game I've played has been 14-26 minutes long. This is the cost of me trying to make a minion build.
Now, if I used minions with pounced maxed, and focused on her movespeed instead of healing wind, and so on, I'd have done much better. But when you try to actually focus on your minions, instead of just using them for cheap heal and additional cheap DPS, you'll fail.
And that's not just when going aganst giants.. but giants are a big way of owning minions.
what abilities insta-kill minions? i havent seen anything like that, everything is damage based. even if its a large amount of AoE damage like a Circle of Fire, having more minion health gives them a chance to survive it if you run them out of the circle quickly enough.
and some of the minions get VERY beefy. Shamblers can get well over 2000 health and a good amount of armor on a high level QoT.
Boulder, fire nova, and there are 2 items(1 is favor, and 1 is cheap, iirc) which instakill anything labeled as "small".