I really liked 'A Thousand Suns' too. I reckon it does have some of what the older albums had, though, but some new stuff as well.
I don't know if all people would understand the use of the Oppenheimer speech, given how full-on the delivery is - it took me about 3 goes to get past that - but once you just listen to the words and look past its' delivery, you realise that they're quite decent. I don't know what anyone else thinks about that, though. ;)
I would have liked LP to search for some slightly more pleasant sounds for some of the instrumentation on some of the tracks, but other than that I really love it all, musically and lyrically. :)