Wrong.
I can think of one specific instance, I'm not sure if it was on the OCR server or not, where the crit boost was the difference in the match, easily.
It was on turbine, and I got into the enemy team's intel ubered as a heavy, so I took care the sentries and whoever was in there trying to protect the intel so our scout came in and grabbed the intel. I always then go up to my medic to the spawn to camp it for as long as possible (which usually isn't very long because they other team will get a decent respawn wave and I won't be able to handle them all alone) but just as they got their respawn wave and they all left the spawn to kill me, we capped and I got ~6 kills right there by myself so our scout was able to easily run in and grab the intel again (Ii died just as he picked it up because they were able to get a good respawn wave again before I got more crits) but they weren't able to set anything up because as soon as we captured again our Soldiers/Demos took care of most of the other team yet again, and we got the final cap with ease.
The crit bonus for capturing the intel makes the idea of first blood look good.