Many of those who seem to not think Torii Hunter is very good are some of the same people who think Gordon Beckham is a great player
They upgrade the offense in a corner OF spot while VASTLY improving the OF defense. Plus, Hunter is an incredible mentor to young players, and has been credited widely with helping Trout, Trumbo and many other young hitters flourish.
Detroit has a small window to go for it all right now, Probably 2 years, but many that window is now Wide Open.
They have 2 of the top 4 or 5 SP in the AL Central, and one of the best 1-2 punches in all of baseball.
They have the best middle of the order in baseball
Now they have a pretty solid defensive OF.
They need to shore up the bullpen, but this is a good team.