You can read about many newly invented sports on this site (see complete list of new sports). For a long time you were able to give them a rating. I have used these ratings to create a top-30 new sports, as rated by visitors to this site. 

The rating system is a global ranking of the sport which factors in the user rating as well as the number of votes (similar to IMDb ranking system). Only sports with at least 10 ratings have been included.

The Top Rated New Sports List

ranking Sport Rating (%)
1 Loofball 86.7
2 Ovasinax 86.3
3 4d soccer 86.2
4 Palmball Association 84.4
5 Hungerball soccer 83.8
6 Space Slam 83.3
7 Volfsball 82.5
8 trampoline dodgeball 81.5
9 yakball 81.2
10 Socket 80.9
11 Baseketball 80.7
12 Cross-Country Big Ball 80.5
13 Frisbee Trampoline 80.3
14 One pali 80.3
15 Flexball 80.2
16 Frescotennis 79.8
17 Feezball 79.2
18 Wheelchair Racing 79.0
19 Ultimate Ball 79.0
20 Trangleball 78.9
21 pong-ball 78.9
22 Palmball 78.4
23 funnyball 78.0
24 Frustrationball 78.0
25 Head Ball 77.9
26 Stupid Robot Fighting 77.6
27 Ball Bros 76.4
28 NJ Ball 76.3
29 Naked Tennis 76.3
30 Footwall 76.3