If you were deliberately seeking out games with people 15 levels lower than you with KC-amb-ghost ship, then yes, that wouldn't be a nice move.
i would probably agree, but why would it matter? does the opponent's valuation of fun matter more than mine? how is this different from the people who just beat up on bots to play an engine and get a win?
The difference is that a bot doesn't care, whereas people get annoyed at that. Deliberately annoying people is, in general, not a nice thing to do. That is not at all specific to Dominion.
You're not a robot or a computer program. You have had a lifetime experience of interacting with people and you can usually make a pretty good guess at how people will react to things. If you do something and have a reasonable expectation that the other person's reaction will be ARGH THIS SUCKS I HATE THIS YOU'RE A TERRIBLE PERSON FOR INFLICTING THIS ON ME - that might be a sign that the thing you're about to do isn't nice and you shouldn't do it! Having fun at the expense of other people is generally the hallmark of a jerk and not a good person!
I mean typically, you're playing a game, both people should have fun. It doesn't always happen - sometimes you get sets of cards you don't like or whatever. But if you specifically set out to make the game not fun for your opponent, then you're being a jerk and you should stop doing that. The details of how exactly you're setting out to deliberately make the game unfun don't really matter.
You know perfectly well that the only reason this thread is here is BECAUSE people don't like being reduced to 0 cards. The OP isn't making sets with just a random overpowered combo that people don't know, it's about making sets with a combo that shuts people out of the game and makes them stop having fun. I don't think there would be much discussion here if the first post was "I love the Hermit-Market Square combo so I just made lots of unranked games and beat lots of people with it", people would just say "hey, that's cool, have fun." But it's not that, it's KC-Goons-Masq which you know lots of people will hate being exposed to.
(So, btw, I take back my suggestion of gaming the casual leaderboard with the KC-goons-masq combo. Game it with something that won't leave your opponents hating you!)
Not-fun games happen. That's okay. But deliberately designing sets of cards in a way that you know your opponent won't like is not cool, and not at all the same thing.
as has already been discussed, they can A. resign without consequence and B. they can see the set coming in and decline playing it. if you enthusiastically agree to play jigglyball with me and don't walk away when you have the chance am i still at fault when you take a tennis ball to the noggin? i'm having a good time, and no one is keeping you around.
If you set up the game of jigglyball underhandedly, without warning people they're about to get a tennis ball to the noggin, then yes, you're still a jerk.
The fact that people WITH SUFFICIENT EXPERIENCE can see the KC-Goons-Masq pin coming doesn't mean that everybody can; lots of people won't realize they're joining a game that's specifically designed in a way that most people find unfun.
You can talk for forever about what OTHER people SHOULD do. But fact of the matter is, they don't, and you know perfectly well that they don't.
If you ACTUALLY wanted to play KC-goons-masq games without pissing people off, reasonable things to do so as not to be a jerk would be:
1) title the game something like "HAND DESTRUCTION PIN" (to hopefully *actually* warn people, instead of the "oh you should have known" type warning which is more for shifting blame than actually warning)
2) and/or actually copy/paste/type a warning first thing in chat: "Hey, glhf. Friendly warning: this set is designed to have a masquerade pin which destroys your hand. It's an unranked game so you can resign at any time if you don't like it!"
3) or make a good faith effort to play with people who would appreciate the pin game rather than hate it (i.e. probably the sort of people who are highly ranked or hang out on these forums)
Of course, Goko could definitely facilitate (3) by having a good ranking systsem and automatch, which would naturally tend to match up people of similar skill (and thus probably match up Srs Gamers with other Srs Gamers and match up casuals with casuals, thus increasing fun and decreasing frustration for everybody). But right now they don't.