1. They're easy to ride. This is the best thing about them.
2. They have full fenders and a coat/skirt guard, along with a full chaincase. When you get on one of these bikes, you don't have to worry about getting dirty from road spray or from chain grease. This is a huge advantage over other bikes and makes city riding enjoyable.
3. They're red and beautiful. I once read a post that said they were the most attractive of all bikeshare bikes, but I can't find it now and my googling has been fruitless. Take my word for it- they're nice looking.
4. I learned yesterday that there's a black line on the front of the seat post that helps you make sure that the adjustable seat is always lined up to face exactly front. That's a great design feature and I didn't notice it until yesterday.
While I could go on, I won't. Capital Bikeshare bikes are great and I'm sorry if I've been unfairly harsh in describing their limitations. But as someone who a morning off of work to attend the launch at DOT, I consider myself lucky as to have access to one (or 1,100).