it is a lot but I think the odds of getting jets are better in the USMC than the USN (or at least that was the way it seemed 20 years ago or so)
I agree, from what I've seen in the last 2-3 years in flight school, if you did well in primary you were going jets if you were a Marine, even if you didn't want them. If you were Navy on the other hand, my roomate was SNA of the year, rocked primary, commodores list with distinction twice (top 5%), solid stand up guy, didn't get anything on his dream sheet, the only thing he didn't list was P3s and thats what he's flying now. In the Navy it was more of a crapshoot on getting jets, did they have any available that week, in addition to having done very well in primary. Now they have tailhook selection out of primary which takes all of the would have been jet or E2/C2 studs and let them compete in phase 1 of advanced for the jet strike slots. Better system in my opinion, get more people into T-45s, and the studs that really shine go on to F-18s.
Lynxman, don't worry about failing the depth perception test, a lot of dudes do. As long as you can pass a civilian one, you're fine. If you haven't already check out airwarriors.com, it's made up of all Naval Aviators (some AF, Army, and CG too!), some with civilian experience, as opposed to this site which is the reverse.
Also, having lived with Marines for the last three years going through flight school, go aviation. You'll never regret it, and you won't be on the ground wishing you were up in the air, and not be able to give 100% to your job. If you really want to, you can do a FAC tour after your first tour and then live your dream as a ground guy controlling CAS.