|Crap! I used to have this!|
Now when I start looking at the game I own and would like to run, I realize that my tolerance for complexity isn't what it was during my High School and College years. Learning the ins and outs of a new system, even one relatively similar to what I already know, is beyond my available time and interest. Work, family, gaming, reading and other responsibilities and interests chip away at that thing called "time". It a limited and precious resource.
For me, the highest amount of complexity I'd be looking for these days is LL AEC or S&W Complete or Blood & Treasure. I've been running ACKS for a few months now, but I've been running it by defaulting to my AD&D knowledge (which is in and of itself inherently faulty after the passage of time) when possible to avoid looking up rules. I've run 3 sessions of Avarice and Ambition with extremely minimal rules stoppage, but that's probably due to the fact that the game designer is in my gaming group, and I ask him the rules questions on the occasions that they pop up ;)
Nothing kills the momentum of a gaming session like pausing to look up rules. That was the great thing about the DM Shields / Screens back in the day - not so much to keep the players from seeing your notes, but to lower the incidence of game stoppage due to rules lookup.
My lowest complexity level for gaming on a regular basis? Probably S&W White Box. Yeah, these are all D&D variations, but it's where I am grounded and the types of games I can play with minimal rules interuptus. I'm sure there are viable rules that are as simple or simpler that S&W WB, but that would require be to rebuild a base of knowledge. That being said, I'm all ears to new games and rules that might fit the bill.
Just understand that Savage Worlds appears to my eyes to be needlessly complex and impossible for me to run as a GM, but it's seen that way by me because of the direction I am coming to it from. I've heard it's a simple game, and even played a session on Fantasy Grounds a few years back and I had fun, but I have no confidence in learning the rules to the point I'd be comfortable running a game. When it comes to running an RPG, if you aren't working from your comfort zone, it's already starting out rough for you and your players ;)