For your above scenario, i don't think numeric event will help.
Assume that I have individual game scores 1600 and 1700. If you capture the numbers using a eVar, you will have 1 Page View for 1600 and 1 Page View for 1700. But if you capture it in event (Numeric), it will have value 1600+1700 = 3300. You can never add a segment where you want to specify "greater than 1500" to get the desired results you are expecting.
I would say, it is better to capture it in an eVar and then classify it using Classification Rule Builder because it has Reg-Ex option to bucket the categories.
For Page Load Time, most people using the same mechanism. Below the screen grab: