Quoted from CaptainNeo:ok, seems ghostbusters is a little over 1 1/2" from tip to tip straight across. Everything else seems to be 1 1/2"
Looks like 1 11/16" on GB to me but hard to tell from the pic. Flipper gap is a very sensitive thing. Taking a quick look at the numbers...
a pinball is about 1 1/16" diameter so the actual gap with ball between flippers on a 1 1/2" flipper gap machine is about 7/16". The GB will have a 5/8" gap. This is almost 43% bigger I'll bet if you did a study a 43% larger gap would equate to more than 50% more frequent drains because the larger gap also makes double flipper saves more difficult because it requires a larger deflection angle to be tipped off the first flipper and then saved by the second flipper.
Final result. GB is a drain monster for both beginner and experienced players.