Ilios is a control map in Overwatch, so as such it has three separate maps or zones to fight within. Here's a quick run down of these three zones and some strategies on how to approach each of them.
Map 1)Lighthouse
Depending on which side you are coming from, there is a building on both sides that gives a good view to the objective that you can get up onto the roof from, this is a great place for turrets or snipers to sit and pick people off as they are coming to or from the objective if that is your play style. If you are a tank planning on sitting on the objective itself then there are a few things to watch for, the main one being there are six entrances into the objective itself. A quick look around and you might argue there are five, not six, well, look up and count again, there's a hole in the ceiling here. Mobile heroes can use this to their advantage to get the drop into the objective, the most dangerous of those being a Reaper with his ultimate ready. If you are protective the objective, watch for this, if you are needing to attack and take the objective over, use it to your advantage.
Map 2)Ruins
The objective on this map is inside of a pit, and very exposed because of it. You can circle around it from any direction and you will still have the high ground against anyone who is actively defending the objective. Because of this, a Junkrat can be extremely good because they can always lob bombs into that objective from a safe distance, and it's very easy to do at that point. You can also sneak past the objective through the building to the side of the objective, and it has a catwalk going right past the objective that'll give you a good view of anyone standing on it. This can be great to use to sneak behind the enemy and flank them, or to rain death down on people on the point itself, since I find most groups tend to watch the stairs instead of this spot.
Map 3)Well
The main thing to watch out for on this map is the giant open well in the middle of the objective. Many heroes can use various forms of knocking people back around this hole and if you stand too close to it, there's a good chance someone is going to knock you into it to your death. Try to knock them in before they knock you in. Lucio can be good for this map because of the alternate fire knockback, or Pharah as she can soar high over the objective and still land a long range knock back. Also, the tall building just beside the objective can be climbed with mobile heroes like Hanzo and Widowmaker for ideal sniper positions that can overlook the entire objective. If there is one of these on the enemy team, look up and make sure they aren't hiding up there.
Map 1)Lighthouse
Depending on which side you are coming from, there is a building on both sides that gives a good view to the objective that you can get up onto the roof from, this is a great place for turrets or snipers to sit and pick people off as they are coming to or from the objective if that is your play style. If you are a tank planning on sitting on the objective itself then there are a few things to watch for, the main one being there are six entrances into the objective itself. A quick look around and you might argue there are five, not six, well, look up and count again, there's a hole in the ceiling here. Mobile heroes can use this to their advantage to get the drop into the objective, the most dangerous of those being a Reaper with his ultimate ready. If you are protective the objective, watch for this, if you are needing to attack and take the objective over, use it to your advantage.
Map 2)Ruins
The objective on this map is inside of a pit, and very exposed because of it. You can circle around it from any direction and you will still have the high ground against anyone who is actively defending the objective. Because of this, a Junkrat can be extremely good because they can always lob bombs into that objective from a safe distance, and it's very easy to do at that point. You can also sneak past the objective through the building to the side of the objective, and it has a catwalk going right past the objective that'll give you a good view of anyone standing on it. This can be great to use to sneak behind the enemy and flank them, or to rain death down on people on the point itself, since I find most groups tend to watch the stairs instead of this spot.
Map 3)Well
The main thing to watch out for on this map is the giant open well in the middle of the objective. Many heroes can use various forms of knocking people back around this hole and if you stand too close to it, there's a good chance someone is going to knock you into it to your death. Try to knock them in before they knock you in. Lucio can be good for this map because of the alternate fire knockback, or Pharah as she can soar high over the objective and still land a long range knock back. Also, the tall building just beside the objective can be climbed with mobile heroes like Hanzo and Widowmaker for ideal sniper positions that can overlook the entire objective. If there is one of these on the enemy team, look up and make sure they aren't hiding up there.