it may look childish but the game is not very childish.
by that i mean it's got a cartoonish look, but the game has better physics and gameplay than tiger woods. however, not too much has changed since hot shots 1 on psx as far as the gameplay goes, other than in the new PS3 one they added a new swing mechanic, but you can still use the old one if you please.
hot shots 1 and 2 are on psx, 3 and 4 on ps2, and 5 came out a couple months ago on ps3. there are also 2 versions on PSP.
its by far my favorite golf game. i play it daily on ps3.