Ahhh, I see yes, they are mid-tier if you desire a straight-up domination. They are one of the better-rounded civs I've played so I'd assume they'd be mid-tier in nearly everything. My strategy is often just to play well and see which victory type they are closest too come industrial, cuz they seem to do well with everything given their powerful territory start. Although, I must say after playing Shoshone, they beat America on that field. still, as a person who doesn't play domination much I was suprised with my last game with them. two wars that I kinda happened to get into right as B-17's hit the market and I realize 30 turns later I own half the world and 4 out of 8 capitals. Part of that was tech advantage though and the fact that the AI won't make peace for 10 turns (most of them were nearly dead in 10 so...) It was like the old blitzkriegs of Civ III, a new layer of cities every 2 and sometimes 1 turns. As my first BNW game I had dropped to King though so it was probably just too easy to tell how they match up to other civs. Any civ looks like a powerhouse when you're the only one with planes, tanks, paratroopers, and helicopters.
I guess with a warmonger civ you want several stages where they have the home advantage, not just 1 or 2 late ones. Is this what you are saying?
As for Brazil and most other tall cultures, yes, I've found I outpace them scientifically playing the expansionist game. If they look like they might win before I complete the spaceship a quick bomber raid and tank blitz on one good city usually ruins it for them. What I'm saying is cultural civs invest so much in each of their few good cities losing one is devastating. Takes like 1/5 of their works which become automatic tourism defense for me. But yes, I usually play AI so they probably suck compared to you playing Brazil.