If we're talking specifically about what the planet would look like, then fields of grass would be reduced to nothing but soil, forests would be reduced to deserts or barren wastelands, and there would be no more coral reefs dotting the ocean floors. As you'd probably expect, anywhere life has once stood is now desolate and empty.
Considering that this is only going to affect biological life, anything manmade or artificial will probably still be standing proud for a while, but after millions of years, erosion would eliminate most of it. Buildings, even the most well-made ones, would surely be reduced to rubble. Only the sturdiest manmade items would survive.
Photosynthesis would come to a complete stop, so there would be no new oxygen made. We have also eliminated life breathing out carbon dioxide, so it seems like the levels of it would be stable. However, volcanoes would most likely be pumping out large amounts of CO2, though, so the balance would undoubtedly be thrown off. Without plants constantly making more oxygen, the air might be near unbreathable after a while, especially after millions of years.
One thing I have not seen mentioned yet is the effect of nuclear power plants or other similar things would have after being abandoned and falling into disrepair. Humans have a lot of toys that they mess with. If they are completely abandoned for thousands of years, even the most well-made ones will break apart and contribute to this wasteland. Artificial materials would erode bit by bit and add a lot of unique features to this land of desolation.
Without life, the world would be a living hell, but, at the same time, if no one's there to witness the destruction, then there's no reason left to care.