What armies best represent the lower tier of power level?

Sorry I've been quiet the past few days. I and my family have been sick with the flu.

I voted for Tomb Kings, Beastmen, DoC, and Bretonnia. Though the last two I'm kinda on the fence about. Daemons of Chaos I think could be decent, but every time I've ever played against them, I've completely obliterated them. And I wasn't even really trying that hard. Could be poor players though. Bretonnia I've had the complete opposite experience. The times I've played against them, I've always lost, but to be fair, I wasn't running a hard list, and my opponent was throwing everything he could at me. Even then it was close. I just think that they are limited in what they can do, and once you learn how to effectively stop their charge, then you've got them beat. That's just my personal experience with them though.

In UK official tournaments, DoW was entirely legal but has to use the extremely outdated 6th Edition. In many of the US big tournaments like Adepticon, players were allowed to use the updated fanmade book. But anyway, fair enough with your focus  .

I was one of the 2 Skaven votes. I have found them a breakable and fragile army. A few bad luck leadership rolls or one one really bad miscast is swingy. They're war machine weapons are huge and destructive, but unreliable. If the opposing general can kill the general and the BSB it seems like bad leadership gets extrapolated quickly. i.e. Implosion.

My data points, which are 90% observed but not played first hand, are that the TOP TIER armies beat Skaven a lot. If you are a good general with 15+ games of leading the Skaven under your belt... OK. You'll probably do fine. Perhaps above average. No offense meant.

All of that said, I love the army. The character, the fluff, the theme. The skittering, the squeaking.

OnG in the lower tier, while I put them in the top tier.
Wouldn't it be interesting if we all got to play each other?
I always feel that we're playing a different game...
HPA and dreaded 13th doing something, death sniping that works, OnG that are weak. You guys live in a wonderful but alien world to me.

I've only played Skaven once in 8th and in that game the skaven magic and doom rocket demolished my Beastmen (though he also suffered a number of misfires). As such I couldn't rank them in the lower tier.

That's an important point. We no longer live in a world of 100+ people Grand Tournaments, national rankings and hard core there-is-nothing-but-win gamers who cook up ever more vicious net lists as the 'meta' shifts with every new army book. These days we are happily sitting in our little ponds and in each pond the big fish can be different. This can be down to player abilities, house rules, scenarios typically played and  terrain placement among other things. I like this new world better (except for the little pond in danger of drying up part) but, it does make discussions like this a bit less...evidence based.

That being said, skaven are evil, they never break (let alone implode) with their in-built Ld10 re-rollable, their spells are horrendous and the HPA deserves to be railroaded of the board every time. As a famous dude once said: "We hold these Truths to be self-evident"

Please explain the inner working of Skavens to me.
How do they get in-built LD10 re-rollable?

I thought they have very basic low LD, like 5... and (sometimes) get +1LD per rank.
But that's for LD rolls, not break tests, right? I have only played against Skaven 3 times, grand total, in 8th Edition rules.