Uugh...if I only had a nickel...
It sounds like you were talking to an enlisted recruiter, not an Officer Selection Officer. Correct?
Here's the deal:
If you enlist in the reserves, you will be an enlisted Marine. That title and responsibility comes first - before school, work, etc. In other words, if you are 'called up,' you must be ready to put your 'civilian' life on hold indefinately. THERE IS NOTHING WRONG WITH THAT ROUTE, if you want to be a Marine. We need enlisted Marines, and we need the Reserves. However, that route will not guarantee you acceptance to PLC, to an air contract, etc. All it will guarantee is a chance to go to Parris Island or San Diego and try to become a Marine.
If you have your sights on only being an officer, you need to talk to an OSO about PLC, or talk to your college about NROTC.
Read around this board; there is plenty of information. Additionally, there are folks here from a myriad ofaccession sources and different experiences that will help you out (provided you do some homework yourself).
However, I cannot emphasize this enough: DO NOT ENLIST OR CONTRACT PLC/NROTC UNTIL ALL OF YOUR QUESTIONS ARE ANSWERED TO YOUR SATISFACTION!