Madmanonfire said:
No, you're stealing that because it's an answer you want to agree with, even though it's a bad explanation. The main selling point is the content.
You want an actual good explanation why the game is so popular? It's because the game is that good. From the likable characters, to the catchy music, to the gameplay-altering bosses, to the different way you can choose to deal with monsters, to the amount of detail that was put into the game to reflect almost every little thing you do; Undertale is a high quality experience. If you let a game's fanbase dictate your experience of said game, then it's your own fault that the experience is soured.
Thing is, my experience is not the same as yours. I found many of the characters annoying, the music makes my ears bleed, and just because the gameplay does something different (except for the random encounters, which is a game design decision that RPGs have largely left behind), that doesn't make it "good." That's because "good" is subjective.
But the funny thing is that I probably could've slogged through the game if someone had bothered to actually tell me why the game was so compelling, because none of the reviews I read and none of the people I asked would tell me. Or better yet, if no one had told me about the game at all (see my above post). I WANTED the game's fanbase to dictate my experience with this game, but the only thing I could get out of
anyone was "Just try it, you'll like it!"
Seriously, you people are like hardcore anime fans. You don't understand that not everyone will enjoy your hobby/game/TV show, and you think that if you shove it down their throats enough, they'll come around and start to like it.
But when you shove something down someone's throat, they tend to choke on it.