for what it's worth, i've been going to every game for quite a while and will do so again this year.
i don't have an issue with traffice. I show up early and don't try to jump on 495 like 80% of the people leaving the stadium. It takes me an 1:10 to get from my house to my parking spot and 1:20 to get from my seat to my driveway.
the sit down/stand up argument is an old one
my position is that the average football iq of stadium goers at fedex is too low and it causes problems. it's one thing to stand on big moments of the game - hell I do it. but the way the stadium is designed if a person stands all game (and many do) the **entire section** has to stand the whole game. go to 8 games a year, year after year, and let me know how long it takes you to start to think that one guy that's there for his one game a year is ruining it for everyone else. standing all game every game isn't the end of the world, but it's really annoying when you pay enough attention and realize it winds up being an entire section inconvenienced by one person...
the parking situation sucks but it's not entirely Snyder's fault. The infrastructure was part of PG county's job, and PG County is the one that decided to take away the bus system for metro riders.
every time i talk to someone about their complaints it almost always boils down to them being a novice and not really understanding things. which can be a bad mark on the stadium itself, but you also have to understand the area. traffic sucks period. try going to a nats/caps game in your car. let me know how that works out. every game i zoom by people waiting to get off at arena drive - traffic backed up onto 495. i go up to my exit and in 10 minutes i'm unloading my car. those people aren't even on the grounds yet. i kind of feel bad for them. kind of. there's guides to getting in and out of that stadium all over the internet, if you can't be bothered to look them up and figure it out then enjoy waiting in traffic.
my biggest complaints are they priced out too many people. when you look around it seems like you see a bunch of drunk 20 somethings that have disposable income to blow on a game or two a year or your have someone that's not even a fan and got tickets from their work or from some business trying to show them a good time.
that and their parking situation sucks. i hope to god they don't build the walk ways *around* the lots at the new stadium. the people don't pay attention to the traffic directors and this causes majority of the traffic problem - if you don't know what you're doing you'll spend half your drive home just waiting to exit the parking lot. they need to build the walk ways through the center of the lots so people can walk straight to their cars and cars can easily leave the lots...
my only other problem is the sheer size of the stadium. i know that if the team was playing better we'd have a higher % of skins fans in the stadium, but there will still be a lot of other teams' fans. bumping it down to a capacity in the 60k's would tip it back to where it should be.