Before they took out...what was it...the summoner spell that made turrets invincible, my roommate was in a match where the enemy team had 5 tanks, all with that spell and Teleport, and he and his team got stomped hard because no matter how many times they killed the enemy team, they couldn't get a single turret, and the enemy team just kept pushing and pushing until they won.

With incredible coordination, it could work rather well. However, not even top teams have coordination to that degree in some cases. For example, teams like TSM and CLG will often place 2 wards in 1 spot because 2 people decided a spot needed to be warded at the same time.
The coordination needed would be incredible, and would be different in every fight. The problem will be exacerbated by burst damage, so I think in general it'll be more difficult to pull off this strategy than it's worth.
GA is really good, especially on AD carries for their only defense item.
Oh, and even if you wanted to run that strategy, don't rush GA >.> you'd just ruin your mid game.
The coordination needed would be incredible, and would be different in every fight. The problem will be exacerbated by burst damage, so I think in general it'll be more difficult to pull off this strategy than it's worth.
GA is really good, especially on AD carries for their only defense item.
Oh, and even if you wanted to run that strategy, don't rush GA >.> you'd just ruin your mid game.
I've done this before.
It prty much never fails :P
It prty much never fails :P

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
+ zil and + yorick = a loooong fight.
It's actually really strong.
It's actually really strong.

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
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So....game was going on and then we noticed....their whole team is rushing Guardian Angel. So its not really a great early game item, so we were kinda outlaning em, had a few kills, etc....
But once they had GA, and started building their offensive items, we got SMOKED. They just KEPT coming. Basically, in teamfights GP would just lay down his ult, Karthus would just go in there Kamikaze with his E activated, GA would save him, Zilean would ult him, meanwhile Yorick used his ulti on vayne or GP, who we're trying to focus, but again, they both have GA. We were wiped out completelly. And when we manage to kill Karthus, boom, revived, teleported, ulted.
I gotta say, I was pretty impressed. With a 5 man pre-made, this seems like a pretty amazing strategy. What do you guys think of it? (and more generally, I'm starting to think that Guardian Angel is an underrated item. The effect is pretty amazing in teamfights - plus it gives both armor and MR.....but no one seems to buy it often)