I own 400 acres in WV and my ATV helps me with my limited schedule. I can go in and hunt a weekend and haul me and my stuff up the mountain and hunt...without killing myself in the process.
When I go for extended periods, I usually leave it at camp. I've killed a lot of deer that I would have driven past.
I bought my current ATV 10 years ago. It is a Bombardier Quest 650 4x4. It has 2000+ miles on it and I've bought tires, filters, oil and a spark plug tube ($15). It has been a monster since the day I got it.
At this point, I think all brands are solid. The only thing is the bells and whistles. I'm not a Polaris fan myself...but to each his own. The only complaint I have about mine is that it is full time 4WD and it's a little rough to steer.