Do these early results even mean anything. Half the time it's like 2% reporting in.
They do and they don't. The overall numbers you're seeing don't mean anything. But comparing the numbers with the same numbers from the same precincts last time around can help verify whether substantial shifts have taken place in the electorate. So I wouldn't pay attention to the numbers or the shades you're seeing, but know that one of the reasons why media outlets can call things as early as they do is because they're making great use of the data here.
Like, let's say there's a state (State X) where we expect 50% of the vote to come from Big City County and 50% from Rolling Hills County. Rolling Hills County reports first and has a 55-45 Republican advantage in the first few precincts. If we know that Big City County went 70-30 to the Democrats the last five elections, we know, even though we have no results from Big City County, that the state is going to go Democratic.