To play the devil's advocate a little bit ...
While I'd agree with the majority of posters here in asserting that there isn't as much problem recruiting "athletes" ... the bigger issue is also recruiting "athletes" who also enter the program with an adequately refined "skill set."
The point here being the following:
1. Iowa has traditionally had trouble recruiting "true" WRs. The problem here, however, arguably has more to deal with the fact that it is GENERALLY hard for the Big 10 to recruit WRs to the harsher midwestern climate. Thus, the offshoot here is that the problem isn't exactly Iowa's alone here.
2. Iowa has traditionally had trouble recruiting "true" LBs who already come with great LB-instincts ... but who also have elite athleticism. There is a reason why Iowa has been forced to recruit safety-types and/or QBs and let them grow/develop into LBs. Quite frankly, this one has been more than a bit of a mystery, especially given Iowa's track record of developing elite LBs. Also, to cut folks off at the pass ... I recognize that Iowa has had some better luck recruiting more highly touted LBs in recent years (Quinton Alston being a more recent example) ... however, it is still rather surprising that Iowa doesn't have even better luck.
3. Iowa has traditionally had some difficulty recruiting DBs who had elite athleticism and a REFINED skill set. It should be noted here that, in general, it can be pretty difficult to project DBs ... there is A LOT of hit and miss there. Obviously, Iowa has had great luck with Godfrey, Fletcher, and Spievey ... however, NONE of them entered the program with a refined skill set. In fact, ALL of them were recognized as being high-ceiling athletes ... but EACH of them also required A TON of development. Heck, by Amari's own admission, he entered the program without much knowledge at all about playing CB ... thus, he had to put in a lot of work at refining his technique to become as talented of a college CB as he became for us.
4. Quite frankly Iowa IS A LOT faster than anybody gives us credit for. However, where the program gets hit particularly hard is where it comes to having a combo of SPEED and TALENT in our depth. In the end, I think that geography likely plays the biggest role there. While I think that "SEC speed" gets overhyped ... I do believe that the warmer geography and the ability to have year-round training for BOTH football and track helps the "speed" down there. Furthermore, the milder weather also doesn't discriminate socio-economically down there. If you want to train for track and football year-round in the midwest ... it usually comes with a price-tag ... the same is not true where the the weather is milder.