That's a tough one! I can normally read just about any pairing if it's sold well and doesn't, say, devalue or erase canonical het relationships (I really can't stand it when the story is full of comparisons and "OH HOW MUCH BETTER THIS IS THAN SHE WAS"). I suppose it'd be nice if I liked Steve/Tony more so I could write it, but it's not like I think it's awful or anything.