The game is good for casuals. If your into games like GoW and such, its a very solid title. If your looking for a hardcore experience however you should probably look elsewhere.
I for one don't mind the easy difficulty so I love the game. But other DMC fans loved the hardcore difficulty of the previous games and thus are very disappointed. Also most don't like the new direction of the art and story. Seeing as you like the screen shots its safe to assume you like the art style. As for the story if you liked the movie They Live this is pretty much like that instead its demons controlling everything instead of aliens.
If you know someone who has the game, watch them play it/play it with them. The demo is pretty misleading, especially if you still have your habits of targeting and weapon-switching from DMC3. I formed a poor opinion of the game based on the demo, but starting from the beginning will allow you to appreciate it more (and give you time to learn the controls).