Medivac + bonfire = bad. Especially against long range, no way to get close enough.
The most important thing against long range is to notice the fact that long range becomes weaker with gametime (as stibi mentioned) and play accordingly. The imperative should be not to get kills, but to get into the middle/late game without any feeding. Play very defensive and stay next to your force's creeps. On side lane i'd recommand the smallest hull asap to be safe and go for Air Ship afterwards (you need the speed). In mid you might get a hull if either you can play offensive against non-long rangers (only 1 long range in the opponent team) or if 2+ players have long range weapons and stuns. Then go for a 4k+ tank. If there is only 1 long ranger (or 2 without stun spells) you can also rush for a tank in the 4k-4.5k gold range. I do not recommend going for heavy tank without hull, the timespan needed is simply too long.
Later on go for teleporter to snipe lone long rangers. In a direct close combat fight they will have no chance if they didn't get a significant number of kills early on. (If they did get lots of kills early on, you are doomed ~~)
There are more ways to cope with long range, but those can be relatively easy guidelines in my opinion.
The most important thing against long range is to notice the fact that long range becomes weaker with gametime (as stibi mentioned) and play accordingly. The imperative should be not to get kills, but to get into the middle/late game without any feeding. Play very defensive and stay next to your force's creeps. On side lane i'd recommand the smallest hull asap to be safe and go for Air Ship afterwards (you need the speed). In mid you might get a hull if either you can play offensive against non-long rangers (only 1 long range in the opponent team) or if 2+ players have long range weapons and stuns. Then go for a 4k+ tank. If there is only 1 long ranger (or 2 without stun spells) you can also rush for a tank in the 4k-4.5k gold range. I do not recommend going for heavy tank without hull, the timespan needed is simply too long.
Later on go for teleporter to snipe lone long rangers. In a direct close combat fight they will have no chance if they didn't get a significant number of kills early on. (If they did get lots of kills early on, you are doomed ~~)
There are more ways to cope with long range, but those can be relatively easy guidelines in my opinion.