He's not hurting, he's probable, and going against a weaker defense. ARI is 31st against the pass, PIT is 12th...though, they both have given up 9tds. Also, 'zona is going East, and we all know their recent woes when that happens, so NYG could really go off.
I've got both in 2 different leagues, and while Rice is coming on, Manningham has been damn consistent since I snagged him after wk 2. They're nearly dead even in yards (17 yds difference), but Mario's got 4 tds vs. Rice's 2.