Since the OP is claiming this was a weak field, lets look at the talent this year.
2013 World Champs 10000m
1. Mo Farah: 26:46 PB, Double Olympic Champion, 2011 Silver Medalist
2. Ibrahim Jelian: 27:02 PB, Returning World Champion
3. Paul Tanui: 26:50 PB, 2nd at the 39th WXC Championships
4. Galen Rupp: 26:48 PB, Olympic Silver Medalist
5. Abera Kuma: 26:52 PB/SB, 2nd in Ethiopian Trials
6. Bedan Karoki: 27:02 PB, 5th at the Olympic Games
7. Kenneth Kipkemoi: 26:52 PB
8. Nguse Tesfaldet: 27:28 PB
9. Mohammed Ahmed: 27:34 PB
10 Dathan Ritzenhein: 27:22 PB, 3rd 2009 WC Half-marathon
Gonna throw the interesting ones in there
12. Imane Merga: 26:48 PB, 26:57 SB, 3rd 2011 WC, 1st in the 39th WXC, 2nd 40th WXC
15. Dejen Gebremeskal: 26:51 PB/SB, 2nd 5000m OG, 3rd 5000 2011 WC.
2009 World Champs 10000m
1. Kenenisa Bekele: 26:17 PB, (At that time) 2008 Double OG, 2007 WC 1st 10000/2nd 5000, 1st 10000 2005 WC, 2004 OG 10000m Olympic Champ, 2nd 5000m OG)
2. Zersenay Tadese: 26:37 PB, 3rd 2004 OG
3. Moses Masai: 26:49 PB, 4th 2008 Olympic Games
4. Bernard Kipyego: 26:59 PB, 3rd at the 35th WXC
5. Imane Merga: 27:33 PB (in 2008)
6. Dathan Ritzenhein: 27:22 PB, 9th 2008 Olympic Marathon
7. Michah Kogo: 26:35 PB, 3rd 10000 2008 OG
8. Galen Rupp: 27:36 PB
9. Kidane Tadese: 27:06 PB
10. GEBREGZIABHER GEBREMARIAM: 26:52 PB,
I'd say the field was on par with previous years, with 2009 having a stronger first man in Bekele, but with 2013 having an overall deeper field. There are more sub-27 minute men in the 2013 final than in the 2009 final, so it is pretty difficult to claim that this year was an extremely weak field.