Honestly, the whole release of something in beta really bothers me. Apple has never done that before (unless you count the embryonic OS X 10.0, which felt a lot like a beta)
Not to be argumentative, but I must disagree. Apple has released beta products MANY MANY TIMES, but always pointing out that it was a beta. I have a copy of the Mac OS X Public Beta (which sold for $30) in a drawer next to my desk as just one example. This came out BEFORE 10.0.
Also, Apple very often puts out software that represents a huge break from what's gone before, and spends several revisions polishing it up. Remember iMovie 07? Oh the howls and gnashing of teeth!! But nowadays everyone thinks its awesome, and it has in a big way pushed the entire video industry forward.
It's like they rushed to get it out so they'd have some exciting feature to sell the 4S with, even though it wasn't done.
You could be right, but I would say Siri's pretty remarkable as-is. A group of us were over at a friend's house last night and played with their iPhone 4S and Siri for hours ... no problems with anyone's voice, of course one much enunciate clearly as English is a language loaded with homonyms and such. There were of course many things it couldn't do, but what it can do is remarkable, particularly in the area of translating natural language.
I would also note that the smartphone business is INCREDIBLY competitive, far more so than computers, which may explain the motivation to get the technology out there first. Also, the whole idea behind Siri is that it will learn and get better from collected user input, so a huge "beta test" is actually a very good idea. By the time copycat Android manages to get something half as good as Siri out there, the next-generation Siri will be out or in the wings.
Still, it can be sort of fun. My friends jokingly told me to tell Siri that I loved her. I did, and it said "I bet you say that to all your Apple products." Mine was the first Siri I have heard say that, so perhaps it read into iCloud to see that I have two Macs, an iPhone, an iPad, and an iPod Touch linked to iCloud?
This is exactly what I'm talking about. Try some of these:
"Will I need an umbrella tomorrow? (wait for result) What about on Thursday?"
"Where is the movie Tintin playing near me? (wait for result) Is there a showing after 8pm at the (name of cinema)?"
"I have locked myself out of my house."
"Read me the email from (bob) about (his vacation)."
"Sing me a song."
In most cases, you will get an answer much more quickly than you would if you had just fired up a web browser or email program and tried to find the results yourself. It's particularly remarkable that it understands context, such as when you say "what about on Thursday" and it knows you mean in relation to your last question. That's a HUGE advance in voice learning, not to mention the fact that it requires no training at all.