With the automatic, from a standstill, there is definitely a big lag. From a dead stop, if I mash the pedal to the metal, it does feel like 2 seconds before real acceleration begins.
Also, if you're just in "D" drive mode, it does take a little time for the transmission to kick down to a lower gear for acceleration. So I like to drive in "DS" mode to keep the engine in the power band for instant acceleration.
The flipper shifter is good, but through corners, they're useless...