Surely the playing group would be questioning hte 3 year plan??
Not many of them have been around for the three years. The "plan" is also largely irrelevant to the issues you raised (which are in-game things).
So, are they questioning the ability of Marty as a coach? Maybe some are privately - haven't heard anything along those lines from an unbiased source. But there have been comments from two players I've mentioned before who are big Marty fans. They don't appear to be questioning him at all, whether they should be or not.
As for coaches and plans, I wonder how many have had luck building for the future? Succession goals haven't worked for everyone. Perth, yes. They've brought through Wagstaff so they aren't as reliant on Redhage, and have a young core. Hire has come up as a guy who can hold his own as a benchie. NZ too - Pledger went from DP to starter, gradually winning his spot from an import. Webster gets minutes. Abercrombie went from ignored at college to a (when at his best) top-tier player.
Sydney? Madgen, yes. Not really anyone else. Got Crosswhite returning to NSW. Harvey because he was dumped by the Blaze.
Melbourne? Dunno. They've brought up Walker and Lewis, whatever you think of them, but the rest are mostly mercenaries, and the team isn't too successful.
Townsville, reliance on the Cedars hasn't really worked.
Cairns, not really, but they have the start of something good now with Steindl and Gliddon, many would agree. Getting Loughton was good, on paper. Only just picked up Tragardh. And Hill was let go by Adelaide. Seemed to rely a lot last year on a good coach and picking up a decent PG import.
Wollongong? Still relying on the starters. Grabbed Martin and Davidson which proved smart. Forman was released early by NZ. Jackson's more confident this season, but his numbers are a bit weak. They can play, but I don't think Demos and Coenraad would have Hawks fans brilliantly optimistic for life after Soup and Sav. I don't think any of their dev players have an NBL future.
The results aren't there and I think fans have a lot of reasonable criticisms of Marty, but building for the future hasn't been awful compared to other teams. Johnson has gone from a bench player to one of the league's better scorers. We got Creek (underplaying him is a separate issue). Lured Cadee. Depsite all the forum hate, I think Weigh is a good, reliable player that we can put scoring pieces around.
What's been rubbish along the way is wasting imports and then screwing up the game coaching.