Obviously a Water-type is not going to be able to take a very powerful STAB super effective hit. What does that prove? Rayquaza sucks because it can be OHKO'd by a Glaceons' Blizzard? No.
Nobody said anything about Charizard or Blaziken, and judging by your username/title, you are definitely defensive about people disrespecting Fire-types because you love them so much. Basically, your opinion is biased rather than objective meaning it's harder for people to take it seriously.
Not every type is equal, not even close. Dragon and Steel types being 2 types in particular which are clearly superior to most types.
Water is probably in the top 3 types in the game. At the very least top 5.