They've got some solid stuff. Not a huge fan, though. I'm more partial to At the Gates and the Haunted.
In Flames is one of the greatest metal bands of all-time. That said, I think they can be somewhat repetitive, but I thoroughly enjoy listening to them and think they're extremely talented musicians.
I'm a big fan of In Flames, they're like my favorite band after Linkin Park I'm mostly into their stuff after Clayman, but the other stuff is great too.