Is this really the best of all possible worlds?

I have been trying to understand some of the philosophical arguments put forth through the years.  Maybe it is a part of my own journey into discovering my self and my own existence.  Yes, there are things which, as part of my faith, I believe, but occasionally, it is good to question.

Leibniz was a famous rationalist philosopher, who tried to make sense of the sufferings and injustices in the world...for if God is omnipotent and omnibenevolent, all that would not exist. As a rationalist, he thinks that reason take precedence over other ways of acquiring knowledge.

I think it is a little hard for me to swallow all that wholesale...
According to what I have read, this is how he derived that line of reasoning.

a) It is God who has chosen to create this world, otherwise, nothing would exisit.
b) There is such a thing as the 'principle of sufficient reason'...which would seem to show that there has to be an explanation why God has chosen to create this world rather than another.
c) God choice of creating this world must be then found in His attributes, since there was nothing else around then.
d) And because God is the Almighty who is perfect, he then created the best possible world....It is the only possible world...for he would not create a world that is not.

Ahhh...the Rationalist...
To him..the world is simply what it is...

There is this rather interesting analogy that follows
The optimist says." The glass if half full"
The pessimist says, "The glass is half empty."
The rationalist says, " This glass is twice as big as it needs to be."

hahaha...no wonder I sigh over that.

Dear God,
Guide me through my journey,
to re-discover You and Your Greatness.
Ameen.