It's only been one game - a game in which he was surely playing with a lot of adrenaline. So in that sense, I'm going to withhold judgment until the end of the season. Truthfully, even that ~20 game sample size isn't enough.
Having said that, I was very impressed with some of the finer points of his game last night. You can see his raw abiliity, but he also seems to be a thinking man's player. You can see the wheels are always turning in his head, he's always scanning, assessing situations. For all of his ability, I always felt like this was an inherent weakness of Miller's game. His hockey IQ, coupled with his questionable work ethic.
I was actually impressed with his ability to play center. He said he is a natural center and he does have the skillset to play that position, it seems to me. Now, is he a top 2 center on an elite team IN THE PLAYOFFS? I'm not quite sure. Tampa fans did say he got thrown around quite a bit when the games got more physical.
He definitely needs to improve his faceoffs, but that is easily fixable.
This is a case where it seems the advanced stats back up the eye test. His ability to carry the puck was most impressive to me. I was sold on him the moment I saw him make that quick move to avoid the forechecker in the buildup to his assist last night. Then once gaining the line, he had the composure to make the right play.
Back to the main point, though, I loved his ability to exit + gain the zone with possession. That's going to be invaluable if we're going to build a new core with the skills it takes to be successful in the modern NHL.
I'm looking forward to seeing more of him. Hopefully he keeps this up. I would like to sign him as a transitional piece now that would then become a very nice complimentary player once we've drafted our star forwards and they start coming into their own.