What Iseroc said. Any deck that inhibits interaction. Mill-decks are a pure waste of time, control-decks are as well. The worst are decks full with counter-spells. None of these deck-types require much finesse and none of these deck-types create fun, balanced, exciting and fair games. Some amount of removal and counter-spells is totally normal and legit, but if every second card you play is removal....well....
How is this even a serious question?
Just play a non-control- or non-mill-deck and meet a control- or mill-deck and you will experience why decks mainly built around removal spells or mill-abilities are annoying. People liking such decks and laughing about people who dislike them are usually people playing such decks because they're unable to play anything else or put thoughts into deck-building. My experience.
But, anyway, such deck-mechanics are annoying for the following reasons:
1) Creatures dying from their controller taking a certain action and creatures dying from something their controller couldn't do much about are different things which will make a player feel more or less satisfied. You lumping "creatures dying" together speaks of little understanding of why humans experience things as fun or not.
2) They don't require any kind of skill. Well, mill-decks do require some sort of skill (which the average mill-deck-player doesn't have which is why you beat them so easily with a somewhat decent deck). Control-decks don't require anything, though. Except playing out one dull removal card after the other. It's basically on the same level as kicking a smaller child just because you can.
3) You, as their opponent, don't have fun and you can't even do anything about it and neither is it your fault. You didn't do misplays, you just waste your time waiting and looking at the other person having fun through being in charge. It's something most people don't like doing. Sitting around, watching others have fun while they don't get a chance to have fun themselves (which is what MTG is about).
Just play a non-control- or non-mill-deck and meet a control- or mill-deck and you will experience why decks mainly built around removal spells or mill-abilities are annoying. People liking such decks and laughing about people who dislike them are usually people playing such decks because they're unable to play anything else or put thoughts into deck-building. My experience.
But, anyway, such deck-mechanics are annoying for the following reasons:
1) Creatures dying from their controller taking a certain action and creatures dying from something their controller couldn't do much about are different things which will make a player feel more or less satisfied. You lumping "creatures dying" together speaks of little understanding of why humans experience things as fun or not.
2) They don't require any kind of skill. Well, mill-decks do require some sort of skill (which the average mill-deck-player doesn't have which is why you beat them so easily with a somewhat decent deck). Control-decks don't require anything, though. Except playing out one dull removal card after the other. It's basically on the same level as kicking a smaller child just because you can.
3) You, as their opponent, don't have fun and you can't even do anything about it and neither is it your fault. You didn't do misplays, you just waste your time waiting and looking at the other person having fun through being in charge. It's something most people don't like doing. Sitting around, watching others have fun while they don't get a chance to have fun themselves (which is what MTG is about).