#1 - you have to want to be a cop first and foremost. I think this is the biggest misconception people have about becoming GW's, is that somehow they are not cops. GW's are cops first and wildlife cops second. So long as you are good with that, you'll do fine.
#2 - you will always be working when everyone else is hunting and you will work just about every holiday.
#3 - it's an incredibly lonely job, but that works well for people who want to work by themselves.
#4 - like teaching and other types of public service, GW is a vocation, not a "job" and not even a "career."
#5 - you'll never get rich
#6 - like all law enforcement, you accept a huge amount of risk and personal liability
#7 - you'll get to see and do things most regular cops can only dream about
#8 - so long as you're dealing with hunters and fishermen, it's one of the best jobs you can have. When you are redirected to work domestics, drugs, traffic enforcement, etc. it is no different than being a county deputy.
#9 - technology has really change the job from what it used to be. You'll find yourself doing a lot of paperwork (still) and making a lot of trips to court.
#10 - Like most LE jobs, it's long periods of boredom interrupted by moments of sheer panic.
If you feel it's your calling, I wish you the best of luck. We need all the good wardens we can get.