User blog comment:TheTobarMethod/Think Twice About Guardian Angel/@comment-8139443-20130413040103

Finally someone who understands :D

GA isn't as good as it used to be simply because armor and mr means less in S3. Even in competitve play, you see way less GAs than before. Now, items like warmogs are way more useful coz it actually keeps you alive in teamfights while constantly dealing damage and also possibly lifestealing some health back.

Other alternatives include scimitar, banshee's veil (those are just from the top of my head - there are probs others.

In a good team, an ADC shouldn't need to itemise a lot for MR and armor anyway - tanky players on the team (maybe jungler, top laner or support) should be getting aura items like runic bulwark. Locket of Solari also provides a nice shield for everyone (though it doesn't scale well into late game).