Remember the Titans was ok.
I know many people love it, but I didn't think it was anything special (and I love football movies).
Denzel has made a few 'not-so-good' movies.
Virtuosity
Ricochet (loved it when I was younger, but saw it not long ago and it doesn't hold up)
Deja Vu
Out of Time
Mississippi Masala
Heart Condition
None of them I would consider out-and-out stinkers though. He has some very average movies as well like Book of Eli, Unstoppable, Man on Fire, John Q, Bone Collector and The Siege. They are ok movies, but like the Titans not much more than that imo.
I forgot another one of his I loved though - Inside Man.
Denzel, Clive Owen, Jodie Foster, Chiwetel Ejiofor, Christopher Plummer and Willem Dafoe in a Spike Lee movie (that doesn't look much like a Spike Lee movie).