Literally the only reason I'm still on Reddit is due to r/sysadmin and their Patch Tuesday threads. It's been a lifesaver and getting more and more important with every Patch Tuesday as Microsoft keeps screwing things up even more month after month. Like how they screwed up RDP, domain trust, audio etc this month. If it wasn't for r/sysadmin, we wouldn't have known about all these issues (especially the domain trust issue, there was little mainstream visibility over it until a day or two ago... and MS still haven't acknowledged it btw), and we would've been royally screwed over.

If there was an alternative to r/sysadmin - one that garners the same level of user reports and discussion - I'd switch in a heartbeat.