I usually have around 50% raid buffed ranged crit but the rocket crits in the 20% range. I've been as low as 15% and as high as 30% on different raid nights when looking at all attempts.
Last night in our 10's run over 5 bosses I went 24 hits, 7 crits for 23% crit. I was probably around 45% ranged crit with the buffs I had.
Landed Dot Crit
Nb 24 7
% 77 % 23 %
Avg 1 439 2 308
Max 1 805 2 782
Landed Dot Crit
Nb 39 15
% 72 % 28 %
Avg 1 995 2 669
Max 3 738 3 233
Landed Dot Crit
Nb 65 28
% 70 % 30 %
Avg 1 430 2 285
Max 1 805 2 824
Ignore the higher damage numbers on the second one, there are heart strikes in there from XT.
Overall the rockets typically account for about 1-1.5% of my DPS. Pretty good and I love watching the little rocket launch
