In opion the "first man down rule" sucks. I open at 2,000 - 2,500ft . From there I can see if the wind direction or strength has changed significantly pretty quickly (my DZ has several flags, and wind socks of differing sizes). I generally do about a 120 into landing, so I fly to a suitable holding point before starting a pattern (note also that my home DZ has a landing area near to the centre for those with 800+ jumps).
However, someone else on a hot canopy spirals down 1000+ft below me, and is pretty much over the landing area. There is no way that I can tell in which direction they are setting up for landing, as I don't know what sort of turn they are going to do (lots of people with very similar canopies) and I can't tell how high they are.
The first time that I know in which direction they are landing is when I see the canopy hit the deck, by which time I am generally at 1000ft or lower. I have not been sitting directly over the landing area as I don't want to get in other people's way. If I am to change my set up now, I will struggle to be in the correct place at the correct time for my swoop. OK, so I don't get to hook on that load, not the end of the world.
However, it is the inconsiderate and selfish nature of the first man down that hoses all those who follow. If the winds are strong, land into wind. If not, follow a pre-determined landing direction. It's not hard. Unfortunately, there are some for whom the rules do not apply, either due to their Skygod status, or because they MUST land into wind.
In my opinion, if you are following a first man down rule, then the first man down should fly an easy to follow pattern that ALL can see. Think of others, not just yourself.
A further problem with "First man down", is when 2 people come into land "first" almost at the same time, but neither has seen the other until they are too low to do anything about it. I have seen this several times, at different DZs, with some very experienced skydivers.
Bit of a rant sorry, but it's a rule that I find stupid and unnecessary. With just a little planning and forethought the problem can be solved.
Blue skies
Paul