I've noticed a lack of hit sprites from time to time. I should add in that I see no apparant damage either.
I've also noticed that even when I have the angle right and fire allot sometimes it SEEMS like I get no hits at all. and Again I see no apparent damage.
My connect lately has been pretty sad at time. One connect, the one that my ISP says should be my best, is really poor right at the AH server. I get as much as 12% packet loss there according to pingplotter. It's a 16 hop connect.
The other connect I use is 12 hops and at time I get some packet loss but it varies as to the location of the packet loss. Usually the loss occurs in or around hop 5 on this connect. Rarely goes over 5% though.
Either connect there are times when I SEEM to get no hits, but a little later I get a kill or an assist. And of course there are times when I seem to get no hits and nothing happens.