I totally agree, but the CPU issue is really a battery issue: in other words Apple's ARM CPUs are very fast and advanced as is, but the reason the one on the Apple Watch is so slow, they needed to lower the CPU clock speed to make sure the battery lasted all day long.Siri isn't the fastest on the Watch, I agree. But it is capable of handling some backlog. Most of the times, I raise my wrist, I say "Hey Siri, set a timer for 15 minutes", I lower my arm, and I check back 10 seconds later if it succeeded. 99% of the times it did.
But I fully agree the watch needs more CPU power and way faster response. And they should fix the 1% of the times when it didn't work. And its Siri should be capable of doing all the things the phone Siri can do.
If Apple succeeds in having a battery breakthrough in the next decade, they will have huge success with most of their products from Apple Watch to the rumored Apple Car.
So far as the predictions for Apple Watch sales for 2016: they are of the same level as analysts predictions that Windows Phones would be well ahead of iPhones by 2015 - pure fantasy.