Lead Free Soldering and bad looking joints
For things that require RoHS, I've been using a version of lead-free popular with assembly houses- Sn99.3/Cu0.7 2% flux, which seems to work okay. 

The joints are not quite as shiny as the beloved Sn63/Pb37 with RMA flux, but quite acceptable. 



Left two joints are lead-free, right joint is Sn63/Pb37.