I for one don't think it's right. On mine, the delay between the 2-3 shift can be three or more seconds. If I ease up on the throttle, I can get it to shift smoother. It will do this as long as the engine temp is under 60 deg C. If the temp gets to 60 or more, the shift is perfect.
None of my other Mercedes have done this.
'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)