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Doesn't any email originating form an AWS server get big marks against it from most spam filters?

EC2's IP range is scorched earth, yes.

SES is in a separate set of IP ranges, and their feedback loops with major ISPs lets Amazon manage their reputation much more closely.

True, but we switched from SES to Mandrill because of delivery problems from SES.

Mandrill was way better, but now it looks like we need to move again. (And our complaint % on Mandrill was somewhere around 0.01%)

I think most generic EC2 instances you'd spin up are hopelessly blacklisted, but I would hope that SES would be less affected by that since AWS would keep its address ranges separated from the EC2 wild west.

But after Googling SES deliverability it seems like SES may have suffered a slight amount from some lax spam reporting standards - the results seem a bit stale so not sure how valid it is any more. Hopefully using DKIM and SPF will help lessen the blow.

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