World of Warcraft Trial

I thought I'd try out the WoW trial to see what all the fuss is about.  After downloading 2.75gb, I was able to start the game only to log in and find I needed a patch.  Was only a 25mb patch but took a long time to update the 10000 files.  Then back into game, log in, another patch!  Then beck into game, a third patch... and I'm now on the 4th patch.  This all seems a bit stupid considering I just downloaded the game from them. Why isn't the downloadable version the latest one?

Edit: Just played the game and completed the first quest and already I enjoy it more than I enjoyed FFXI. It seems to actually have structure and is friendly to new players :)