A very interesting discussion above, I enjoyed reading it.
Personally, I think Kramnik's contribution to theory is much bigger than Anand's. The Petroff, the Berlin, the Catalan etc have immensely deepened with Kramnik. And also the fact that he beat the greatest player of all times in a WC match is probably as big of an achievement as anything Anand has done.
Chesswise, however, I think the peak of level of chess Anand has reached in his later world championship events might just equal to Kasparov in his best form. I mean that positively, he has arguably demonstrated the highest level of chess ever to have been reached in history in his WC games. I think he is the only player comparable with Kasparov and Fischer in that respect. He made it look easy on Kramnik and a lot of people supposed Kramnik was simply "not on form," well yes maybe he wasn't at his best but that's something you could add to Anand's list of pluses because he really has done an outstanding job taking Kramnik into his home turf there, playing d4 as white which has to take a tremendous ammount of work as he had almost no experience in it in serious encounters, and forcing Kramnik to play very sharp, complicated positions in which he excells. He beat him very convincingly. Let's also not forget that Topalov was also at his peak when he got beaten by Vishy and had access to a huge computer cluster with the latest version of Rybka which wasn't publicized. Anand only had the relatively modest Hiarcs cluster for a much shorter time.
I'm pretty sure Anand is the most talented of all champions, and when he combines that with serious preparation (which he does, for WC events), he becomes something out of this world, and he has done this in a surprisingly older age, which I'm sure would take a lot of discipline and professionalism.
I think he is also the nicest guy in the top level of chess. He never trashed talked anyone, never got into controversies. He is one of my favorite players with Botvinnik and Kramnik, I respect him a lot as a champion and like him as a person. A rare combination.
Winning the championship in all formats, and doing that very convincingly in a relatively old age for top chess players after staying at the elite level for decades is a VIP ticket to the hall of fame.
I think he will have no problem defending against Gelfand, and I would still put my money on him in the next cycle, be it against Carlsen or Kramnik. That would be amazing to watch.
To summarize, I think he is up there with Kasparov, Karpov, Botvinnik, Fischer and Kramnik in the history of chess.




For me the greatest achievement of Anand is to have actually been part of the elite without being from the Soviet school (before computer prep existed ) and having being so consistent over the years despite all the changes in the chess world
Yes, Anand didn't have much help in that respect. When India participated in the Chess Olympiad in 1980 (the first time they had a team since the 1960s) their only titled player was an IM rated 2305. India of the 1970s wasn't the best environment for talented chess players trying to improve, at least not compared to the Soviet Union.