To be quite honest with you, TMart played better at QB last year than Dennard Robinson did. Check the stats. Robinson is an electrifying athlete but an absolutely sh**ty QB. He threw 15 picks last year. That is unacceptable. It appears that he is holding Michigan back from what they really would like to do.
Taylor didn't have any really rough games last year like he did against Washington 2.0. He also never had a great game like he had against Washington 1.0, K-State, or Oklahoma State. Ohio State maybe. He was consistently good, but never really great.
As for being better than Robinson. Not sure I could go that far. As you said, look at the stats. 7 more picks, but also 7 more touchdowns. If those extra picks were so unacceptable, then they wouldn't have finished with as many wins as they did. Otherwise very similar passing stats. Dennard edges Taylor with a 139.7 rating to Taylor's 126.5. He had 5 100 yard rushing games to Taylor's 3. 1176 yards to Taylor's 874. 5.3 per cary average to Taylor's 4.6. 16 rushing TDs to Taylors 9. And in the most important game of their season, against Ohio State...he was 14/17, 167yrds, 3TDs, 0INT, 26 attempts for 170 yards. Big time QBs perform in the big games.
Also, you should look at the scrambling ability of the 2. Dennard had 7 sacks in 2010, 13 last year. Taylor had 26 in 2010, 21 last year. And if you try to blame all of those on the OL then you definitely weren't watching the games.