Earth sucks? A lot of people didn't used their earth mark because they didn't wanted to loss the access to grabbow in late rounds. 
I personally don't think a single element suck, however most people don't view
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as a good element, maybe because of war (team
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is not doing well at the War event) and, when a poll with 3 tiers was out a few months ago, most people had voted Earth as tier 2 or 3...