I can't think of a bad movie he's made. I celebrate the man's entire catalog.
This is sort of my take, although I wouldn't go that far (not sure if serious).
I've never considered myself a "fan" of Tom Cruise, I don't particularly love to see him act or anything. But he's one of the few actors who has a good enough sense of taste, and enough control over the end product, that they rarely are in flat-out, money-grab stinkers. Some are not great, and I certainly haven't liked them all, but there's sort of a minimum level of quality that you can expect. It's going to be anywhere from meh to pretty great. And there are some, like the Mission Impossible and Jack Reacher movies, that I like a lot more than I would ever expect.
I really, really like one of his lesser considered movies, Knight and Day. That movie is great to me, and he's great in it. It's a very well done Hitchcock homage, but people just didn't really like it. Of all the people who have tried to do modern Hitchcock (DePalma, etc) it's by far the best to me, probably by taking a spin on Hitchock's action adventure films, rather than his creepy/suspense catalog.
Now, I didn't see The Mummy, by all accounts that's pretty horrible.
I don't really care about what he's like personally, I just don't. If you go down that road, you won't watch anything.
For a long time at least, you could say the same about Jodie Foster, never in something truly irredeemable. I haven't kept up with her more recent catalog.
