Is he still fairly mobile? Yes. A bit slower, but still pretty agile on his skates. It was fun to see how bigger prospects at training camp thought they could push him around in a board battle and end up puzzled when he skated away with the puck or sent it to his teammate.
Solid defensively? Probably the best defensive defenseman on the Bolts even when babysitting a rookie Sergachev or McDonagh as a new player to the team.
Still decent PMD? Yup. If you're inclined towards stats, he was tied with Hedman for the best possession exit % of the Bolts blue line.
Strengths/Weaknesses? Strengths - plays smart defense and is rarely out of position, excellent complementary player that makes his partner better, can make bad partner passible (see Garrison), great mentor for gifted rookie defensemen (see Sergachev). Weaknesses - point production has fallen off considerably from his two record seasons right after being acquired by TBL, while part of that was deployment (he's not on the PP and has been babysitting most of last season) and part was injury recovery related, it is a concern. Is not and has never really been a true #1D, but has been an excellent #2 for us.
Next Contract AAV? Not a clue!
Does Stralman want to stay in Tampa? Does Tampa want to resign him? Probably wants to stay because he's always been concerned foremost about stability for his family (has 4 kids) and he does like it here. Tampa probably wants to re-sign him because losing all three of Coburn, Girardi and Strålman would decimate our blue line, especially on the right, some of our prospects aren't quite ready yet and if they're going to keep one vet D as a mentor to the babies coming up, Strålman is definitely the better player/mentor of the three and one of our regular alternate captains and sources of stability in the locker room. But everything depends on how well BreisBois can manipulate the cap with everyone who is coming up for big money.
If he goes UFA, does $4.5M/3yrs get it done (in DET)? I agree with Sky that only TBL would be able to get him for less than 5m on a short deal. He's got enough skill left in him that there would be plenty of teams interested.
Peace & best of luck in the '19 playoffs. Same to you! Unless we're playing each other.