I don't think it's straightforward. You have to consider injuries and personnel development:
1. 2014 (through 14 games): 31.6 PPG; 5465 yards from scrimmage (1526 rushing, , 45 TDs (12 rushing, 33 receiving); 328 1st downs, 46% conversion on 3rd and 4th down
Gronk - 1093 (20%), 11 TDs (24%)
Edelman - 1066 (19.5%), 4 TDs (9%)
Powerback (Ridley-Gray-Blount) - 1011 (18.5%), 9 TDs (20%)
LaFell - 819 (15%), 7 TDs (15%)
Vereen - 773 (14%), 6 TDs (13%)
Wright - 232 (4%), 6 TDs (13%)
Other - 471 (9%), 3 TDs (7%)
The 2014 offense has been very efficient, especially over the past 10 games, in which they have averaged 36.2 PPG. The OL isn't as good as it was in 2011, and there haven't been as many points off of turnovers as there were in 2010. There have been 3 games scoring 27 or fewer PPG in that period. But all things considered, it's been a solid performance.
2. 2012: 34.8 PPG; 7028 yards from scrimmage, 59 TDs (25 rushing, 34 passing); 444 1st downs, 50% conversion on 3rd and 4th downs
Welker - 1374 (19%), 6 TD (10%)
Ridley - 1314 (19%), 12 TD (20%)
Loyd - 911 (13%), 4 TD (7%)
Gronk - 790 (11%), 11 TD (19%)
Woodhead - 747 (11%), 7 TD (12%)
AHern - 487 (7%), 5 TD (8%)
Vereen - 400 (6%), 4 TD (7%)
Bolden - 285 (4%), 2 TD (3%)
Other - 724 (10%), 8 TD (14%)
If healthy, I think this would have been the best of the bunch. They got 25 TDs and over 2100 yards rushing, and Woodhead and Vereen were the most versatile RB-receiving pair the team has had. Woodheado-Vereen-Bolden accounted for almost 1500 yards rushing and receiving and 13 TDs, and Stevan Ridley added 1350 yards rushing and 12 TDs. What hurt this offense was injuries to Gronk and Hernandez, who missed a combined games and were only on the field healthy together for 3 or 4 games all season.
3. 2011: 32.1 PPG; 7021 yards from scrimmage (2184 rushing, 4844 receiving), 57 TDs (18 rushing, 39 receiving); 399 1st downs, 47% conversion on 3rd and 4th down
Welker - 1599 (23%), 9 TDs (16%)
Gronk - 1329 (19%), 18 TDs (32%)
Powerback (Lawfirm-Ridley) - 1280 (18%), 12 TDs (21%)
AHern - 955 (14%), 7 TDs (12%)
Branch - 702 (10%), 5 TDs (9%)
Woodhead - 508 (7%), 1 TD (2%)
Other - 651 (9%), 5 TD (9%)
The 2 TE offense was a major force, but there wasn't a lot of WR activity other than Wes Welker, and the running game fell off a bit.
4. 2010: 32.4 PPG; 5995 yards from scrimmage (1973 rushing, 4022 passing), 56 TDs (19 rushing, 37 receiving); 335 1st downs, 48% conversion on 3rd and 4th down
LawFirm - 1093 (18%), 13 TDs (37%)
Woodhead - 926 (15%), 6 TDs (17%)
Welker - 848 (14%), 7 TDs (20%)
Branch - 706 (12%), 5 TDs (14%)
Deep receiver (Moss-Tate): 633 (11%), 6 TDs (17%)
AHern - 610 (10%), 6 TDs (17%)
Gronk - 546 (9%), 10 TDs (28%)
Other - 633 (11%), 3 TDs (%)
The 2010 offense was overhauled during the first half of the season, with the Randy Moss and Deion Branch trades and the move towards an offense built around the 2 TEs. As Oswlek notes, it was dominant during the 2nd half of the season, averaging over 37 PPG.
I like the power running game and RB corps of 2012, the 2 TEs of 2011 and the 2nd half of 2010, and Brandon LaFell as an X receiver. I don't think the 2014 offense is quite as good as the 2012 version or the later 2010 version, but if Gronk can stay healthy it will be better for the playoffs, and the defense this year is much, much better, putting less pressure on the offense. The 2011 offense probably had the best OL of the bunch, too.
It's pretty impressive how consistent some of the offensive numbers have been given the turnover and changes.