The electronic nerd in me finds this discussion very interesting. One of the earlier comments was something along the line of "measured latency of 1 to 4.5ms of delay compared to an original. 4ms is lightning fast." Fast is relative - 4ms is certainly long enough for experienced players to notice, even if they can't find the right terminology to express it.
Also I must have missed it in the conversation, but beyond any electronic control issues, wasn't there the basic element of flipper travel angle being reduced? That alone would make a substantial difference. Unfortunately I have not had the opportunity to play the new version, so I don't have any frame of reference.
Finally, unless a game has been reproduced using all the same elements, opinions of gameplay are inevitable.