Eager Queen

I have been told recently from several different people on how bad this opening is but I don't see why... Could someone please clear it up for me?

Clearly, your opponent played the wrong move. It is certainly a poor opening.

Since others have proved its bad, this is why strong players don't use it.  The patzer opening is an occasionally used name for the above opening.

Strong player - Patzer opening: My opponent refutes my opening, and I end up in a worse position, reducing my chances of winning.

Weak player - Patzer opening: My opponent falls for my trap, and I quickly finish him off.

Strong player - Normal opening: I play soundly, and have slightly better odds of winning.

Weak player - Normal opening: I beat him, since I can beat any person that would lose to the patzer opening.

So as you can see, in both cases the weak player still loses, but my odds against strong players are reduced!  So it makes no sense for me to use this opening.

In your case, as I assume you are about the same strength as the people you are using Qh5 against, you might just win more often.  But, amazingly, I still have a problem with an opening that allows you to win a lot.  I believe yasser seirawan (a renowned chess author) told a story about this. 

An experienced chess player was trying to dissuade young yasser from using the patzer opening.  He asked him "How many times have you won with that opening", and yasser cheerily answered "Lots of times!".  Then the wise chess player said "Ok, whats the last time you learned anything using it".  Yasser reflected that with the exception of finding out his opponent was vulnerable to this perticular trick, he hadn't learned a whole lot.