You should read through the card ranking lists; and consider that there's a lot of players on this forum who are really top-tier players. Meaning; that they know a lot more about what cards are more powerful than others than you (or I) do. Opinions and personal preferences are all well and good, but a statement like "it is the most powerful gainer in the game by far" simply comes off as arrogant in the face of better players saying otherwise.
I disagree for two reasons:
1) Qvist's rankings aren't always super accurate, partially due to a lack of consensus on what it means for a card to be "powerful", partially due to psychological reasons why people rate cards inaccurately even when they know how strong they are in practice (e.g. cards that are very similar should be very close in strength, but it's very easy to compare those cards against each other so that makes people focus on the minor differences more than they should), partially due to players not knowing how to utilize cards to their full extents even at the top level sometimes, and partially due to the algorithm being imperfect when it comes to dealing with low-rank players having incredibly stupid opinions, such as giving all Attack cards the lowest possible rating. They're more for fun than anything else.
2) Dominion skill isn't one-dimensional. Someone who sucks at deck tracking will have a very hard time getting to level 60+, for example, but that same person can easily know why everyone else is playing Jester wrong, and their insight on that subject is worth listening even though they suck at deck tracking. Case in point: when silverspawn first joined the forum, he was largely ridiculed for stating that Lookout was underrated, but as it turns out, he was mostly correct according to current consensus.
Now, I don't think that Chase is correct here, but there are real reasons why he's wrong and none of them are "Qvist's rankings disagree with you" or "top players disagree with you".