I'm not actually convinced he was any worse after his accident than before it. People always point to 2008 and 2009 as the baseline for his pre-crash form, but those were his two best seasons by a country mile. Take a look at
this graph, which was made by the guy who runs the F1Metrics blog. It is how his model rates each individual season of Massa, Raikkonen and Button, using data up to "early 2015" (so it is a little out of date, but is sufficient for my point).
Massa's average form from 2002-2007 is rated almost identically to his 2010-2015 form. It is only in 2008 and 2009 that he performed significantly above that level.
For context, the ppr values in that graph are ~0.4 higher across the board than they were at the end of 2015. This is because the ratings are generated based on a reference car, and the model changes it's perception of that car's performance as more data is added (the ref. car is the Red Bull RB9). If we subtract ~0.4 off all of Massa's ratings from that graph we can then compare them to the
2015 end-season rankings.
- 2008 (7.25) and 2009 (7.06) fit into the gap between the 2015 ratings of Button (7.39; 4th) and Nasr (6.98; 5th).
- 2002 (6.21) and 2005 (6.18) are rated fractionally better than 2015 Bottas (6.14; 9th), but worse than Ricciardo (6.72; 8th).
- 2010, 2012 and 2013 all fit in the close midfield grouping stretching between Bottas (9th) and Massa's own 2015 season (5.75; 13th). This group also includes Grosjean, Perez and Raikkonen.
- 2011, 2007, 2014 and 2004 fall into the gap between 2015 Massa (13th) and Ericsson (5.28; 14th).
- 2006, 5.27, is rated as Massa's worst season and is comparable to 2015 Ericsson (14th).
- 2002-2007 and 2010-2015 both average out to 5.72, fractionally lower than Massa's own 2015 season.
Note that the amount that the ratings have decreased between when he made the graph and posted the article are only approximately 0.4; it isn't exactly 0.4 and each individual season will change by slightly different amounts. But the figures will be close enough for general observations.
We can see that in 2008 and 2009, Massa performed very well and joined the level just below the very top drivers, which is what I refer to as "Button-level". However, across the rest of his career he has floated around in the midfield, usually in the mid-to-lower regions of it but occasionally towards the front of it (2002, 2005).