ohh its not that bad, just unorthodox. When it works it is rather pleasing to the eye and a hell for the opponent to read.
He went from this:
https://www.youtube.com/watch?v=UJG00aKsvDg- Not a bad looking forehand, but flawed. The take-back is OK, but then it starts to be a bit shaky. Note the pronounced "L" as opposed to a nice "C"
To this:
https://www.youtube.com/watch?v=rQ3S3oPEd14#t=26- Still the "L" motion but with slightly lesser pause and more take back, spin and follow through. More "brushing" on the ball where before he had more of a "head on" collision.
It sure works better on the clay courts, but I think on grass and faster courts the slower, more deliberate take-back robbing him of some time.
He also needs to improve timing on it and foot work. He sometimes does not position himself proper for the bigger windup and ends up falling backwards a bit. This should iron itself out with time, after all, he completely changed the FH motion mid career. These things take time to settle in.
....but his moving forward on short balls is fantastic now, where with previous motion he would NET a ton of easy mid court balls.
Whatever he did with his FH, it was the right thing to do. It makes him more focused on "present", execution of the shot, as opposed to "thinking ahead" of the shots and NET-ing tons of easy shots. To me THAT is the main difference between Gulbis now and Gulbis before - the put-aways. Once you hit a few easy shots - confidence follows...
Level 13 Edberg and counting...