I've played guitar and drums for quite a few years now. Hard for me to come up with any strengths and weaknesses. I just do my own thing. I've never really bothered myself with music theory. I just play, and if it sounds like shit, then it sounds like shit. But I'm still getting something out of it. Helps me understand the instrument, and it stays fun. I'm much more interested in making music than practicing scales or arpeggios or whatever.