Quu —— Your experience is your experience so this isn’t me telling you what you should have experienced. My experience, however, is different from ours. Here is some of mine.
Siri -
Siri works well. My main dislike is that Hey Siri only works when the watch face is on. I feel sure this is to conserve power. This is at least better than my iPhone where Hey Siri only works when plugged in.
Some of the limitations on Siri are perplexing. I can say “Play songs by…” and it works but if I say “Play Classic Rock Radio” it wants to hand off. I would expect Siri on the watch do do anything with the Apple Music app that the iPhone Siri can do. I expect this will be a future software upgrade.
Still, Hey Siri is nice for controlling music when I’m driving.
UI -
I like the UI and find it responsive enough. I find third party apps slow but that isn’t a UI issue. WatchOS2 should help with third party app speed.
Messages -
I haven’t run into the iMessage issue you have but understand what you are saying. I love that my phone doesn’t ding when the watch is on my wrist. Certainly messages aren’t as full featured as the phone. I wouldn’t expect it to be. To me the issue with your friend is a special case that you handle on the phone.
For me, I am able to triage a lot of my daily messages. I have a local TV station and CNN which keeps me up to date on major events including road closures without reaching the point of annoyance. On email I just receive my VIP list as notifications on the watch. That makes sure I don’t miss important emails while limiting notifications.
I also like getting a vibration on the wrist compared to a ding on the phone. I find messages are now a lot less intrusive and yet I miss fewer of them. I often missed the ding when in a restaurant but I rarely miss the tap on the wrist.
Directions -
The left and right turn notification is cool. When in a rental and using my phone for directions was nice to look at my watch for the distance to the next turn vs. looking at the phone.
Digital Touch -
Useless unless you have someone who sends you LU messages during the day. Fortunately I have someone like that. She sometimes gets creative with the drawings.
Exercise -
I like the heart rate monitor and the way it tracks walks and runs. I dislike the flakiness of the exercise ring. I can do 45 minutes at my target heart rate range and only get credit for 20 minutes of exercise.
Techies vs.non-techies -
I keep mentioning this because I think the distinction is important when reading a review. My girlfriend (definitely non-techie) led her watch from day one. She saw it as a pretty watch that told time plus did some other neat things. She loves the heart rate monitor, messaging and the hands free phone feature. She often leaves her phone in her purse or has it set down somewhere so the watch is a quick way to answer calls.
My experience was very different. I set mine up and then thought “Now what?”. It wasn’t like when I got my iPad where I played with it for hours. Slowly I realized that the watch isn’t an entertainment device. It just reduces interaction with the phone. It used to be so annoying to take my phone out just to see a text message that said “OK.” A lot of text messages I get don’t even require a reply. I just saw one from my girlfriend that says “On my way.” Without the watch that would have meant pulling out my phone. Slowly I have adjusted to my girlfriend’s viewpoint and come to really enjoy my watch.
Watch bands -
There are very nice inexpensive bands available and it looks like Apple is supporting an entire watch ecosystem. I made the comment that the Apple bands aren’t exorbitant. Here is what I mean. Here is a nice upper end watch band:
http://shop.hodinkee.com/collections/italy-straps/products/brown-textured-leather-strap
At an even more extreme price point, a Rolex Jubilee stap in steel is about $1860.