I can attest to slivers being no fun to play against. My friend made one that was pretty much unbeatable (but he didn't have a couple of the real pain in the ass ones like other people would use).
As for my decks, I never really had great success with any of them. Probably, funny enough, the best one I had made was a red deck that I started with the 9th Ed starter, and then grabbed some 9th Ed boosters (along with the same cards from previous editions) and made a decent deck out of it. Had some direct damage, and some goblins, but didn't focus on either.
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