I've been going to shows at Lee's for over 10 years now and I have so many good memories coming out of this place.
As mentioned, the sound quality IS much better than it used to be. I remember seeing some shows in the early 2000's with just awful sound quality. Last 1-2 years it's noticeably much better.
The general set up seems good in my opinion. The main pit area in front of the stage is perfect for people who want to dance, mosh or crowd surf. The rest of the standing area is raised, so you don't risk getting trampled by any nutters in the pit area. Drinks are served at the far back, but even the "far back" isn't too far away, you can still see the stage.
I love the wall-seating around both sides of the room, you can actually see what's happening on stage (bonus for short people)
It's a shame the bathrooms are so grungy, but when my fav band comes to town I can definitely deal with it.
The famous exterior wall mural has been redone recently (same artist) and it looks amazing.