I don't think the comm is that bad out of whack. If you look at the cage communicator and the normal TOS one, it is a good mix with the exception of a brass type lid. I have to say I was shocked to read someone say the NX was a better design, because when Enterprise first came out, there was serious bashing of that show's prop designs. That show was before Enterprise and the communicators were much smaller and high tech in design compared to TOS.
I think they stayed pretty "believable" so far. I haven't seen the phaser yet, so who knows about that. I agree that the Tricorder prop isn't really the tricorder, but some piece that goes "with" it.
It is a hard line to walk, trying to make the original fans happy with continuity while trying to rebuild the franchise with new fans. I don't think kids today would like a movie that looked like a terrible 70's remake of a Sci-Fi with big boxy props and sets.
I can't wait to see what the inside of the comm looks like!!
Jhusel