'Big' ultron was the one who fought toe to toe with Thor. But was hurt by the three lasers. then finally finished off by hulk and scarlet witch.

Is anyone here really hoping that Ironman does not die when Thanos almost takes his life? 

1. How Thanos know about Tony Stark? And what does he means that Stark is not the one cursed with "knowledge / wisdom"? soul stone

2. What makes THOR think that Time Stone and Mind Stone is safe with Avengers on Earth when he and Hulk is terribly beaten by Thanos previously? Avengers are basically the guardians of Earth. They'll find a way to protect the stones

3. Wait, did Dr Strange simply reveal Eye of Agamoto to strangers all the time? Thor only barely met Dr Strange in Ragnarok, how does he know that's Time Stone? he can use fake trick like he did to Thanos before he gave it away. no one would know about it except him.

4. Why Thor can locate Wakanda easily? Did he possessed the same power like Heimdall when he gained Storm breaker? And how he Teleported? bifrost power can transport him anywhere

5. When team cap strike on corvieus glaive and proxima midnight at Scotland, where they following Wanda all that time? A little too convenient leh. they track her there.

6. If wakanda is opened to outside world, why is it still cloaking in camouflage. it's not fully open I guess

7. Why nick only summon Carol / Captain Marvel now? Why not during Battle of NY? he wants to see whether avengers can cope or not with the aliens. if cannot then no point of having the avengers assemble protocol

8. Does Thanos have the control over who to die? yes with the soul stone

9. For comic readers, what is the possibility for the vanished heroes to be revived? not a comic reader but it's very highly possible

10. Same as THOR, how did Thanos locate Wakanda? If the stones gave him the signal, he don't need Gamora to locate Soul Stone. Right? with space stone, he can basically goes anywhere in the galaxy

11. Can't Dr Strange just use time stone to return to the time before Thanos forge the gaunlet / starts collecting the stone to stop him? time stone can't be simply be used. he did try to see all the possible outcome to beat thanos.

Because it revolved around his mission to obtain the stones, why he feels the strong desire and conviction to get stones. This is a huge departure from the comic where he did it because he craved ultimate power to win over Mistress Death. He is known as the Mad Titan. In this movie, he comes off as a misunderstood savior of existence, wanting to impose harsh population control and then retire to his farm at the end. It's like Ozymandias in the Watchmen movie, he has a motive but it's just a cruel way of seeing it through.