For Michigan, Their most experienced returning wide receiver caught less than 200 yards. They do have a lot of recruiting stars, but I think the consensus is right. Michigan's receivers may be good someday, but perhaps not this year.
As for quoting the heights of receivers, Rutgers has 8 wide receivers taller than 6'0. Penn State has 9. I'm not sure that's a good indicator of talent. Heck, I'm not even sure recruiting stars are a good indicator of talent. However, given that Michigan has recruited 9 wide receivers over the last 2 years, I do believe they will find some quality young players.