Okay, so the way I’m reading it, a lot of people miss the point of a metagame, or why it matters. You have people saying things like this:
That’s why I asked the question. We were clearly looking at abilities in a vacuum for Yellow, so why not green as well?
The problem with this is that looking at abilities in a vacuum is all but meaningless. For example, we all know that OBW’s aggressive recon is good. Really, really good - to the point where a 2* with just over 3k health got 7th in the last character ranking poll. But what if the meta was centralized around Falcon+Daken? Is Aggressive Recon still good if people are using predominately that pairing? No. In fact, it becomes virtually worthless, because almost all of your damage will be coming from match damage and passive skills - losing AP doesn’t matter to you much at all. But right now? Much of the damage we do is based on rather expensive nukes, or needing multiple colors - World Rupture+Sacrifice, CTS, RotP, etc. Losing 3AP in each color, especially when you’re relying on one color to help fuel another, can be game-changing. The value of the skill is entirely dependent on the metagame.
But okay, I guess AP steal is something of a special case. What about other skills? Well, imagine a meta in which match damage is gigantic, health is gigantic, but powers were not scaled up. What would the best green skill be? Would it still be CTS? No - CTS would be thoroughly mediocre. What would be really great, though, is a skill which causes cascades and destroys tiles - something like X-Force or Unstoppable Crash.
The point here is that skills do not exist in a vacuum. The only way you could possibly say “Skill X is the best in a vacuum” is if all the skills did the same thing, such as is the case in red, and then you can compare apples to apples. Even then, though, you have intangibles to compare (overwriting a tile vs. destroying red tiles vs. destroying shield tiles), and none of it can tell you if a skill is good - only if it’s better than others. But other than that? You need to talk about the meta, and what’s going on therein. Are people playing glass cannons or tanks? Are people playing normally or shieldhopping? Is AP denial good or are people appealing to Daken and Psylocke to get their damage in?
Which brings me to Sentry.
If you think World Rupture is not far and away the best green skill in the game, you are wrong.
Why? Because in the current meta, World Rupture is meta-defining. It’s not just “good”. It’s not just "the best green skill. The presence of World Rupture in the meta, combined with any skill that can create strike tiles, shapes every single thing about top-level play. There is nothing in the game like it. Nothing in the game is anything like it, and nothing in the game even scratches the surface of the power on display. Even patchneto before the nerf wasn’t winning games in under 60 seconds - even if they were doing it in 3-4 turns, the animations for C.Mag’s powers would take quite a while. Wondering how people are hitting 1700? World Rupture is what enables that - shieldhopping so fast that you’d have to be insanely lucky to catch it. It cannot be overstated how big of a deal this is.
To get an impression of value, imagine what would happen in the metagame if you removed CTS and World Rupture. Ditch CTS and Thor becomes a weaker character, and you just replace him with another tanky bruiser with good AOE - Black Panther, Colossus, Deadpool, Sentry. Ditch World Rupture, and people are now struggling to hit 1300 again. That’s the difference.
Seriously, though, saying “Skill X is good in a vacuum” or “Skill X is good independent of the meta” is kind of like saying “This cake is good independent of how it tastes”. It’s a thoroughly meaningless statement.
(On a side note, Sacrifice is not unconditionally the best yellow skill in the game. Why? Because it’s replaceable. Because you can use Battleplan, or Berserker Rage, or Escape Plan, or anything else that drops chunky strike tiles and still win with world rupture. The true value of Sacrifice is that it’s self-contained, meaning that you can win with a 2-man team of Sentry+Loaner in any PvP fast enough to get your shield back up before someone slams you. It’s good on its own, but neither essential nor unique and so can be hypothetically evaluated on its own merits.)