Topalov is probably the only FIDE World Champion of that time that I'm willing to accept. He won a strong tournament in great style, scoring 6.5/7 in the first series of games.
Other 'World Champions' like Chalifman and Kasimdzjanov are just jokes, they are or have been very strong grandmasters, but don't come close to the level of play of Topalov or Kramnik.
I know that during the rift with FIDE that many "fide world champions" arent accepted by all as "real world champions". I know that Topalov falls into this category. Where do you stand ? Do you recognize him as a ( former ) WC ? Why or why not ? I will give my own opinion later....