Are you required to be tall and beautiful to become a Hollywood actor?

Alan Chenkin, Learned about celebrities reading tabloids in the checkout line.
It’s nice to have genetics that give you height and looks, but talent and hard work are the real thing, requiring training, rehearsal, and commitment to the craft.
The featured image above this article compared the actors in “The Fast and the Furious” by Height.
A most prolific and hard-working actor is Danny DeVito, who does not let his height interfere with his Hollywood success.  At a staggering 4′ 10″, DeVito’s filmography speaks volumes to his talent and acceptance.
Lots of actors are tall and stunning, and are eclipsed by short and talented – Look at Jason Alexander, 5′ 5″, who had a starring role in Seinfeld:
Have you ever heard of this lady, Academy Award Winner, Linda Hunt?  4′ 9″ of acting powerhouse.  She carries a gun in the TV series NCIS Los Angeles.
Embrace who you are, hone your skills, talent attracts people, regardless of your appearance. 
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This post is expanded from my answer in Quora.

Would the Alien movie series be better if Arnold Schwarzenegger had the lead role?

When we have tough choices when interviewing people for leadership roles.  It’s easy to play armchair quarterback, especially after the fact.  You have to wonder if a blockbuster, experienced predator killer like Dutch would have been better in Aliens than Ripley, thrust into the role by corporate circumstances.  She transforms from a woman just doing a job to jousting with the a species determined to use every other species (specifically humans) as a means to procreate.
Alien benefited from Sigourney Weaver’s vulnerability and inner strength in the Alien movies. Arnold Schwarzenegger, Already a blockbuster, “Kick-Ass” movie star, would have done a good job, but we already expect him to be a “super-tough bad-ass” alien killer.
The closest example is Arnold in “Predator”.
I am a big Arnold Schwarzenegger fan, but I don’t think he would be a better Ripley.
But wait, there is MORE-  
Sigourney Weaver has a feminine sensitivity that Arnold just Muscles through.  He is a Juggernaut of pure horsepower, while Ripley is more emotive.  Both are effective in their roles, and accomplished actors.  In my humble opinion Arnold would be obviously miscast in Alien, or the picture would have to be re-structured for his acting persona.  Likewise, Sigourney would not have the comic presence of Arnold in “True Lies“.  Think about it.
 
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Last Word, Delivered by the Governator:
Arnold on Hatred in the US