My first impression of your original slide was that it was very aesthetically pleasing - I could see it being used on the channel. However, when I read it I did think this is what every channel controller would like to say to their audience - but they just don't do it that way. Some time ago there was a big push to make continuity more "user friendly" - but it didn't get this far - quite. I haven't seen your revision as I'm logging on today from work. I have read some good/positive comments about it though.
I do like what you have done with the "hd." In my opinion, much more could have been made of these important initials - and, bearing in mind what they stand for, a bit of gloss and shine and a bit more thought into how they would look would have been a good thing. So, all credit to you for doing just that.
As for taking the criticism personally - of course you are going to do that - afterall, the comments are about your hard work. All I can say is though don't think about going into television as a career choice. Even though I love it, you do need a thick skin. You can make the most wonderful television in the world and nobody will say anything - cock-up and it'll feel like the sky has fallen in after all the negative feedback. Just the way it is - in most places.
Overall, I think your first go at a mock has been very, very good and I look forward to seeing much more of your work in the future.