I'm not very familiar with term "SPOILER", but I think this topic could need it.
In 2003 I made an Excel file to compute the championship in different points systems. I think could be interesting to see it:
Current points system (top 15): (10-8-6-5-4-3-2-1)
1 Fernando Alonso Renault 117
2 Kimi Raikkonen McLaren 94
3 Michael Schumacher Ferrari 60
4 Juan Pablo Montoya McLaren 60
5 Giancarlo Fisichella Renault 45
6 Jarno Trulli Toyota 43
7 Rubens Barrichello Ferrari 38
8 Ralf Schumacher Toyota 38
9 Jenson Button BAR 32
10 Mark Webber Williams 29
11 Nick Heidfeld Williams 28
12 David Coulthard Red Bull 21
13 Jacques Villeneuve Sauber 9
14 Felipe Massa Sauber 8
15 T.Monteiro Jordan 7
Pre 2003 & post 1989 points system: (10-6-4-3-2-1)
1 Fernando Alonso Renault 101
2 Kimi Raikkonen McLaren 83
3 Juan Pablo Montoya McLaren 46
4 Michael Schumacher Ferrari 40
5 Giancarlo Fisichella Renault 29
6 Jarno Trulli Toyota 26
7 Rubens Barrichello Ferrari 23
8 Nick Heidfeld Williams 18
9 Jenson Button BAR 17
10 Ralf Schumacher Toyota 16
11 Mark Webber Williams 13
12 David Coulthard Red Bull 7
13 Jacques Villeneuve Sauber 4
14 T.Monteiro Jordan 4
15 Alex Wurz McLaren 4
Pre 1990 points system (9-6-4-3-2-1) (without 11 best results selection):
1 Fernando Alonso Renault 95
2 Kimi Raikkonen McLaren 77
3 Juan Pablo Montoya McLaren 43
4 Michael Schumacher Ferrari 39
5 Giancarlo Fisichella Renault 28
6 Jarno Trulli Toyota 26
7 Rubens Barrichello Ferrari 23
8 Nick Heidfeld Williams 18
9 Jenson Button BAR 17
10 Ralf Schumacher Toyota 16
11 Mark Webber Williams 13
12 David Coulthard Red Bull 7
13 Jacques Villeneuve Sauber 4
14 T.Monteiro Jordan 4
15 Alex Wurz McLaren 4
Pre 1990 points system (9-6-4-3-2-1) (with 11 best results):
1 Fernando Alonso Renault 84
2 Kimi Raikkonen McLaren 77
3 Juan Pablo Montoya McLaren 43
4 Michael Schumacher Ferrari 39
5 Giancarlo Fisichella Renault 28
6 Jarno Trulli Toyota 26
7 Rubens Barrichello Ferrari 23
8 Nick Heidfeld Williams 18
9 Jenson Button BAR 17
10 Ralf Schumacher Toyota 16
11 Mark Webber Williams 13
12 David Coulthard Red Bull 7
13 Jacques Villeneuve Sauber 4
14 T.Monteiro Jordan 4
15 Alex Wurz McLaren 4
EXOTIC POINTS SYSTEM: MotoGP system (25-20-16-13-11-10-9-8-7-...)
1 Fernando Alonso Renault 300
2 Kimi Raikkonen McLaren 255
3 Michael Schumacher Ferrari 170
4 Juan Pablo Montoya McLaren 165
5 Rubens Barrichello Ferrari 153
6 Jarno Trulli Toyota 145
7 Ralf Schumacher Toyota 142
8 Giancarlo Fisichella Renault 133
9 Jenson Button BAR 106
10 Mark Webber Williams 100
11 David Coulthard Red Bull 94
12 Nick Heidfeld Williams 93
13 Felipe Massa Sauber 88
14 Jacques Villeneuve Sauber 71
15 T.Monteiro Jordan 58
16 Christian Klien Red Bull 58
Alonso is only champion with the current one, although close to the title with every one except the system of the late 80s, when only 11 best results were counted. In this case the fight would be veeeery close.