My thoughts, these will just be random:
Hagaman started at LT 1st team and was the weakest spot, luckily he is really 3-4 down the Tackle depth chart.
McMillion was owned time and time again but he is a true Frosh and finishing his first week of Iowa camp. Tough task to try to stop Clayborn. Clayborn is the real deal but I'm not reading too much into his dominance because it should be expected given this situation.
RB's today went O'meara, Brinson, Robinson, Rodgers, Brown. The last two won't see the field this year. O'meara broke a nice run but was caught by the backside CB (Lowe). Robinson made a nice catch and run on an underneath route. They looked okay today, IIRC the RB's, including Greene, didn't do much last year either. Not a lot of room to run with the OL trying to figure it all out.
1st team OL got a nice push on the right side. When they ran behind Doering and Dace they moved the ball 5 yds a pop, the other way not so much. Reiff looked okay at G, Dace still a little slow on the outside rush.
2nd team OL really struggled. I doubt Ferentz sees the field this year, if so the OL may be in trouble.
Davis looked the part, he did line up more than once in the wrong position. I think he will slowly be worked in, depends on how fast he learns the playbook.
McNutt is a big target and really provides a nice run blocking WR. Chaney looked good today making a couple of nice moves after the catch.
I would still consider Vandeberg and Wienke 2a/2b. Neither did much to prove one better than the other. Again, the 1st team DL didn't give them too much time in the pocket.
Lebron Daniel had a nice day at DE. Troy Johnson is another solid 2nd teamer that could fill in if necessary.