Amazon SES rocks from a pricing standpoint but deliverability isn't its strong suit.
Huh?
Are you sure you have configured it correctly, including DKIM?
We're using SES a lot (both transactional and campaigns) and never had a problem with deliverability.
There are too many spammers using it.
That seems unlikely considering the default sending limit is a mere 10k mails/day (iirc) and I doubt Amazon lets you raise that when your complaint-inbox is overflowing...