Very sorry to hear of your less than pleasant experience with the Motorola Bionic. The sad part is that for a small subset of the ever massively larger group of owners, problems can often seem to be unique to a particular phone model, manufacturer, version of OS or carrier, however its simply not true in most cases. Forums are places where people go for one of several reasons, but the prime reason people (I'll inject - most typical members - here), seek out and join a forum is because they're experiencing something with their product that seems to be unique to them and they can't figure out or find the solution elsewhere. So what you have is an unusual concentration of people with "issues" with their devices.
Let me say here, the issues you suffered were real and I am very confident based on your post, frustrating. What I am saying though, is that there was probably one or perhaps a small set of, we'll call them "things" which contributed to the issues you were dealing with, that if properly diagnosed and dealt with directly would have turned your disappointments into triumphs. We have a huge member-set which are very much "Bionic fans", and feel it was if not the best, one of the top two or three phones Motorola has ever made. The following for the Bionic was massive and very tight, and very loyal.
On to the S4... It's a beautiful phone, gorgeous screen, fantastic camera, feels good in the hands, performs magnificently, and I believe you will be very happy in the long run with your decision to upgrade. We have a great team of members and staff here who are also big fans of the S4, several Moderators, Super Moderators and even some of the Admin own and love it, so support is in place and will be there for you going forward.
I wish you much success with your new and very exciting Samsung Galaxy S4.
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