Who is worse than the Reds (if they're not the worst)? The Pirates? Royals? Expos/Nationals? Maybe the Orioles? Blue Jays? I think at least the Royals are headed in the right direction as are the O's.
I realize it's tough to fully categorize what you're basing "worst" on...yearly record, playoff appearances, drafts, trades, farm systems/player development etc.
No matter what, you'd have to say the Reds are at least top 5 worst franchises this decade, right?