I tried an oolong (can't remember the name) today. Don't think I used enough leaf.
A good rule of thumb is 1 tsp for ball oolongs and 2 tsp for less dense varieties like baozhong or dragonwell if you're brewing with a gaiwan.
Do all green teas have as much of a vegetable taste as Dragon Well? If so, that's not for me!
I've never thought of dragonwell as having a vegetal taste, but if that is not a flavor you enjoy, definitely avoid Japanese green teas like gyokuro or tamaryokucha. However, keep in mind that as you continue to try teas, you will find yourself appreciating qualities you didn't enjoy on first sip. The first time I tried gyokuro I thought it tasted horrible, but it soon became one of my favorite teas.
The hard part comes in the expectation. For a new tea drinker who has only had black teas or cheap oolongs from a Chinese restaurant, you are likely to miss out on the subtle nuances of a young unroasted Dong Ding or be shocked by the vegetal qualities of a Japanese green or the earthy taste of an aged pu-erh. Know that tea is all about discovery, and that keeping an open mind will be very rewarding over time.