This offense suits Eli tremendously to boot. Many said he couldn't operate a west coast style offense. McAdoo is still evolving as a coordinator but:
Eli Manning:
TD: 32
INT: 11
%: 63.7
Yards: 3900
AVG: 7.1
Rating" 96.9
Two games left to go. He'll be 35 as you mention and the last two seasons have been tremendous outside of some boneheaded decision making at the worst times (it IS Eli afterall). The presence of Odell is a big factor there obviously but considering the Giants have had a completely non-existent running game and nearly very few weapons outside of Odell - the job Coughlin/McAdoo have done on the offensive side of the ball is impressive to say the least.
Spags was just given almost nothing to work with on the defensive side.
My issue with Spagnuolo is that he's been a DC for 4 years in total and in two of those years he's led the worst defenses in the league, including an historically bad Saints defense. His Rams weren't exactly defensive powerhouses either.
Being a successful DC with a world class DL is a lot easier than putting crap players in the best spots to be successful. Some coaches can manage it, looks like Spagnuolo can't.
My main issue is at the end of games he plays his corners 10 yards off and blitzes, all the receivers have to do is sit on the route or slant in towards the shit linebackers (those who aren't blitzing) and it's an easy completion.