Mattingly was good for 6 years, not a decade. He was only great for 4 years, and mediocre pretty much other than that. He was a fan favourite, like Joe Carter, but not HoF material. No way he should be considered.
Griffey should probably make it, and based on his domination both defensively and offensivley in the 90's and his resurgence this year, he deserves it.
I don't think he should be in. I'm sure there is some guy in there with worse numbers that makes people think Rice should be in too, but a 300 BA with 30 HR power isn't something spectacular. Maybe I'm blinded by the fact that 30 HR is average for a power hitting OF this era, but his stats just don't impress me that much. Also, he played a lot of DH, especially early in his career when he should be at his best defensively, which leads me to believe he wasn't a very good fielder.
Trammell doesn't appear to have been that good offensively, but for a SS he was definately very good, and since I'm not sure of his defense (you always hear about the Trammell and Whitaker connection, but that was because they played together so long, not because of their skill I assume) so I can't really make a good judgement. I guess the same goes for Ryno.
Dale Murphy had a bad BA but good power. He was great for 10 years, then absolutely horrible for his last 6. Something that might keep him out of the Hall.
Just my 2 cents on all those players. I'm sure many will disagree, but it would be no fun if everybody had the same opinion