Most land based animals with blood do look like us.
they mainly have four limbs, head and body - that's quite similar really.
Not really, unless you're really, really stretching the definition of "similar". I presume by "animals with blood" you actually meant "mammals". The reason mammals all have a roughly similar body plan is because we all descend from the same common ancestor. The way that the basic arrangement of four limbs, torso and head is actually
applied is incredibly diverse, and it's ludicrous to say that any non-primate species really resembles a human in any significant way.
Incidentally, most land-based animals with blood are insects. They have six legs, a head, a thorax and an abdomen. Oh, and antennae. And usually wings. So not very similar at all.
I don't know of too many animals that look like giant slugs with 17 odd shaped irregular pieces sticking out.
You are again, presumably, not including the entire insect and arthropod kingdom in your definition of "animals". Not to mention starfish, octopoids, or indeed
anything that isn't a mammal.
Man is the final destination but species branch off from it as they evolve and get stuck in their place until they die - then they get another chance.
Wrong. Just straight up, fundamentally wrong. There is no destination in evolution, and
homo sapiens isn't even an ideal one if there were.
And what on Earth are you talking about with this "then they get another chance" thing? Are you suggesting some kind of pan-species post-extinction reincarnation?
I'm not saying man is the best but why don't we have any Avatar like creatures running around, or big green men with 7 heads and arms?
We don't have them, because they didn't evolve. They didn't evolve because, regardless of what people like you may think, evolution doesn't work on the basis of what "seems like a good idea". Evolution works on the basis of what
works. What benefit would 7 heads be to an organism?