#1
Whenever i want to learn a new song, despite having a fairly wide music taste; from Steve Vai to MJ and from Orianthi to Megadeth, i only ever seem to actually focus on songs from one band: Metallica

I do pick other songs sometimes but i never really stick at them as much as i do with Metallica songs, is this a bad thing for my guitar technique and prowess?
#3
I started off that way with Maiden back in the eighties.

You'll grow out of it.
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#5
If you're only going to learn to play songs by one band on guitar, you could do a lot worse than Metallica.
#6
that's the way a lot of people are, I was like that too, only learning Tallica songs. Sooner or later you'll start to want to learn other songs, don't get worked up about it.
#7
Not at all. Learning their entire library should keep you busy for awhile
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#9
I mostly just write and play my own stuff. I learn riffs here and there when one catches my ear and sounds fun to play, but I usually don't bother learning anyone else's songs unless my band intends to cover them. I learned some songs back in the first year or two I was playing, though. Mostly Tool, Blink-182 and, surprise surprise, Metallica. At one point I could play along with the entire Master of Puppets album, minus the solos. Then I didn't play any of it for like 5 years, and now the main couple riffs from MoP is all I remember.

But yeah, learning songs is great practice. I just kind of got out of it once I got a pretty good grasp on the instrument, and the music I wanted to make myself.