I'm the youngest of a few kids in my family. My siblings always used to complain that I wasn't made to do any work and I was so spoiled. This is a widespread misconception. The youngest has it just as hard as the oldest.
The reason behind this view, is that when you're a kid, you don't have any concept of how much responsibility should be given to someone based on age. Usually this is evidenced by children's whining about their lack of freedom. That's why you always complained about adults staying up late, and you were forced to go to sleep early. But this also works the other way. When you're 12 years old, you can handle setting the table. Me at age 5...not so much. But the 12 year old thinks-hey why do I have to do this and he doesn't? Well the answer is that when you were 5 you weren't setting tables either. And when I'm 12 I'll be the one setting the table.
Now that all my siblings are married, guess who all the chores go to? That's right. The youngest. Mr. Spoiled. We end up doing more work in the long run.
But to parallel that with shidduchim- I don't know who has it easier. I think it depends on the family. If you're siblings are normal, healthy people, people will think of you as a well-established commodity. On the other hand, if you've got a brother who went off the derech, and an unmarried sister who doesn't leave the house... then it's going to be more difficult for you. (B"H I'm the former.) But an oldest sibling doesn't go into shidduchim with any preconceived notions, as to what type of person they will be. They're their own man.
Additionally, the youngest, as in my case, might not have any siblings to hang around the house with, and it can be just a bit lonely. But their are benefits like going to siblings' houses for meals, asking them advice, etc.
My point is, everyone has their own unique challenges. And don't call us youngest ones spoiled.