Best way to create character is Karma generation. One and only one system available for both, creating and upgrading character is very good, creates quite ballanced characters with wide variety of skills.
Floating Target numbers are worse evil I`ve ever met, 5/6 hit system is much better. Again. IMO
I serriously hope that 5ed would come out later than sooner, as I`ve spent maybe 500USD for books and dont want to spend it one more time too soon, because books/characters/gear would be incompatible in next editon and for sure it would be following current CGL business model, that is, creating core books and then as much "DLC`s" as possible, like recent example Street Legends/ Supplemental, Black Book etc showed.
I can see it would be cheaper to buy whole new edition instead of buying Runners Companions...LOL
Well, on the other side, there is really lot of things that need to be improved in core rules, such as Matrix issues, where more antagonistic approaches applies on one thing in SRA core X Unwired, things like Reality Filters exists etc. But I see this can be solved by only a slight changes in existing rules