I'm going to adjust the way I'm saying this so people don't feel like I'm attacking them personally. Anybody can like any band, music group, whatever, that's their opinion. It's all good, every genre needs its fans. Take Nickelback for example. They have many fans. However, people often confuse "liking" a music group with thinking they are "the best". Nickelback is not anywhere near the best bands of all time, not even close. Here's the thing. Nobody likes to hear that their favorite band sucks. Nobody does. My favorite band, Megadeth, is pretty good. I LOVE Megadeth, a LITTLE more than I like Dream Theater, but I would never tell anyone that Megadeth is better than Dream Theater. DT is on a whole different level. I can't stand Rush personally. That's my opinion. But Rush is WAY better than 99% of the bands I listen to, there's no denying that. Saying "Rush sucks" is like saying The Flash is slow. You can say "I don't like Rush", because you know, opinions. But you'd be wrong in saying they sucked.
Anyone can "like" anything. If you're the type of person that just don't care about musical talent, that's ok. You don't have to like anything else. Pretty much everyone started liking music with radio songs. Some people just stick with that their whole lives and that's great. I don't judge people who listen to any music and I hope nobody else here does. However, if you're really into music, want to learn an instrument and are looking for the well written works or something that has a lot more complexity into it, you want to listen to a band that knows what they're doing. That know how to play really well, so you can learn from "the best".
I would never tell anyone in person that they listen to a bad band. People just don't like hearing that and, as evident in this thread, just don't understand where I'm getting at. I'm not saying "I don't like them, they suck". In fact, my personal opinion has nothing to do with whether they're good or not. Some bands I don't even know if they're good or bad. I'm sure there's some amazing undergrounds bands out there that I may or may not like...but I don't know which ones because I haven't found them.
Enjoyment, likability and emotion from music is completely and entirely opinionated. What the person receives from the music itself is an opinion. Like, I said, everyone has different tastes. It's the people writing and playing the music that determines whether it's good or not.
I hope to God that someone understands where I'm coming from here. It seems like everyone gets so offended when I say that something they like is bad, that they act like I committed a crime. Like I said, nobody wants to hear their favorite group sucks. But I even admitted that Linking Park is in my top 5 and I KNOW they suck. I meant nothing personal, and if someone wants to discuss in a mature way what makes a band better than another, I'd be ok with that. We're just having a discussion after all.