I just ran some testing on the proc rate, doing just auto attacks:
1018 hits out of 1057 swings
21 procs of Romulo's Poison
Total proc damage: 5950
Average proc damage: 283
Proc rate per hit: 2.06%
Proc rate per swing: 1.99%
Proc % of overall damage: 2.28%
I'm guessing it only procs on hits, either way the proc rate is about 2%. For a combat dagger rogue with slice'n'dice up all the time, that's anywhere from about 1.75 to 2 procs per minute, depending on offhand weapon speed. Or 7.9 to 9.4 dps. That's not including special attacks, so we'll be generous and call it 10 - 12ish dps. Not really a fantastic dps boost by any measure. Thank God Blizz added that hit rating.
1018 hits out of 1057 swings
21 procs of Romulo's Poison
Total proc damage: 5950
Average proc damage: 283
Proc rate per hit: 2.06%
Proc rate per swing: 1.99%
Proc % of overall damage: 2.28%
I'm guessing it only procs on hits, either way the proc rate is about 2%. For a combat dagger rogue with slice'n'dice up all the time, that's anywhere from about 1.75 to 2 procs per minute, depending on offhand weapon speed. Or 7.9 to 9.4 dps. That's not including special attacks, so we'll be generous and call it 10 - 12ish dps. Not really a fantastic dps boost by any measure. Thank God Blizz added that hit rating.