I was impressed with Mire in the SL series. But then SL bowling has been exposed in recent months barring one fluke up in Dharamsala. Mire is a slogger. He will come good once in 15-20 innings. He may actually far better on pitches with pace and bounce given his penchat for pulling and cutting with a horizontal bat. But those tracks come with Rabada or Cummins bowling on them.
Hamilton I was surprised by in SL and the Windies Tests. But I remained skeptical given he's been around the better part of 2 decades

(black Tendulkar!). But his real test will be this tri series against quality bowling and in the matches vs Afghanistan (quality bowling) and Ireland (clutch situation in ICC event). You include Netherlands Windies Scotland too if its a kockout.
Ervine is class. At least I still think so. He has a technical flaw or two but so does most everyone.
Taylor is class but maybe he's past his prime. His form at Notts was declining all last year. Never the fittest guy so that might be slowing him down a bit. A few less pounds and that footwork and batspeed may help. You still back him to show up. Needs to improve his terrible away record.
Raza and Cremer. Superb.
Jarvis. Almost as good as the above.
Blessing. Lots of potential. Stick with him even if he gets tonked at times.
Chatara. Meh performance but he has a solid record. Keep backing him for now.
Everyone else should either be dropped or if young, needs to hit the nets and work on mental toughness and situational skills.