No, I don't know.
McLaren has problems, but Brawn GP has the same Mercedes engine and they are more than second faster than anyone in few tests. And remember that they were Honda last year and drives are the same, Barrichello and Button.
Thursday times from Barcelona:
1. Rubens Barrichello, Brawn BGP 001, 1:18.926
2. Nico Rosberg, Williams FW31, 1:19.774
3. Timo Glock, Toyota TF109, 1:20.091
4. Sebastian Vettel, Red Bull RB5, 1:20.576
5. Fernando Alonso, Renault R29, 1:20.664
6. Felipe Massa, Ferrari F60, 1:20.677
7. Robert Kubica, BMW Sauber F1.09, 1:20.740
8. Lewis Hamilton, McLaren MP4-24, 1:20.869
9. Sebastien Buemi, Toro Rosso STR4, 1:21.013
10. Giancarlo Fisichella, Force India VJM02, 1:21.045
11. Sebastien Bourdais, Toro Rosso STR4, 1:21.629