Well, where to begin...
Despite having roleplayed for a couple of years now, I'm something of a rookie as far as Shadowrun goes. I have, however, already run the quick-start stuff with one small group I know, so I'm not completely in the dark on it.
Okay, more seriously, it's just learning how it all fits together from the player's side that I need to understand before I call myself comfortable with the system. My experience with Shadowrun amounts to a couple of video games (the SNES one, which I understand as being little help here, and a slight amount of Shadowrun Returns), that quick-start thing I mentioned (my players in that insisted that certain parallels between the Shadowrun setting and the modern day are too close), and a bunch of stories that were recovered from Dumpshock's archive (about what NOT to do when running the shadows). In other words, I have a few pieces deciphered but they're kind of scattered.
I should note that I'm one of those people who will try to push the envelope, so to speak, with character concepts and then try to play said characters seriously. For instance, with the 5e rules I find myself trying to seriously come up with a proper concept and backstory for a troll decker.
Go ahead, laugh.
.....
Seriously, though - and following up from someone else's welcome post - I actually got this sudden appreciation of tabletop RPGs (until about three years ago, I didn't think much of them) after spending enough time on MMOs. Something about those felt... stifling compared to tabletop gaming. I've also found that unlike a fair number of roleplayers I know, complexity does not really get to me - I can pretty much learn ANY system given enough effort.
So... yeah, that's me in a nutshell.