I had the same problem. I imported a .sld file from geoserver to qgis and it seems some (or many) things are different. The worst of all is the algorithm applied for rototranslation. Apparently, the offset x, y and the rotation (or data defined rotation) fields, don't work together in a rototranslation function. Searching until something like the 10th page on google and merging every little piece in as many forums, I found out if you have to apply a rototranslation data-defined formula, you must set up some things manually. First of all, you have to set up the data-defined rotation field, remembering that, for some reasons, the angle is shifted by 90 degrees. Then you have to place the rotated label in a coordinate computed by the real rototranslation formula (rotation and translation combined). To do that, I find this formula to output the best results, in the Offset X, Y field:
concat ( -A * sin ((90 - "field") * pi () / 180) -B * cos ((90 - "field") * pi () / 180), ',', A * cos ((90 - "field") * pi () / 180) -B * sin ((90 - "field") * pi () / 180) ) where A and B are 2 constants for offset and "field" is your data-defined field Sorry if something is unclear, this method is a quite unfriendly way to accomplish this need Marco
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