Isn't it boasting

I started to read essays of successful candidates from various backgrounds who got admitted to different schools. Some of the essays are really well written. The moment i read them, i felt like.."Yeah. i should admit this guy". They have a clear vision (at least looks like) of what they want from their MBA. Their long term and short term goals are clearly laid out. They know what they want from that particular school and how they are going to contribute to that school. All their accomplishments are deftly interwoven with lucid explanations. Some start their essays with catchy statements and for some its bland. Nevertheless they filled their essays with interesting anecdotes and crafted a beautiful story.

BUT, there is something which i felt is awkward. Plainly most of the statements in their essays looks like a total boasting. Here are the few sentences which led me to make this statement...

- I did everything from managing campaigns, schedules and marketing. (What does it sound like, if you say you did everything?)
- I am responsible for motivating, empowering, creating team structure and ensuring quality delivery to the client. (Not too much, but sounds like a little show-off)
- I am an industrious and ambitious person who is not afraid to challenge the status quo. (I think it is better to tell the adcom that you are industrious and ambitious by providing them with real life examples, rather than simply making a direct statement that you are industrious and ambitious).
- I am an accomplished multi-tasker who will fit seamlessly into X and can enrich the environment with my maturity, enthusiasm, problem solving ability blah blah blah...

There are many others but i forgot them. It was told many times by sages that mba essays are nothing but marketing yourself. The lesson is "it is better to boast rather than being humble".

Notes:
1. After reading these essays, i am clear with one thing, you can't write your essays in a day or two. Like i read in one of the blogs that you should write your essays daily (atleast for a one to one and half months). You never knew when you will be hit a kickass idea.

2. When the essay question is about the long term and short term goals, many of the applicants wrote their long term goal first and later explained their short term goals. Is it a norm or some kind of strategy. I don't understand this.