Fair enough, I don't watch the game so I wouldn't know.
It's the same old story on here, when you aim a hint of criticism at a player (while at the same time accepting that he has some redeeming qualities) people who disagree suggest you know nothing about football and they themselves are football savants who's knowledge about the game dwarves your own.
Jack is a decent player, nothing more. If he was exceptional, we'd have had offers for him from bigger clubs. He is never spoken about as one of our sellable assets the way Morelos, Kent, Kamara are and Bassey and Aribo were, and the reason for that is that there appears not to have been much (if any) interest in him* from other clubs. Why is that?
Anyway, IMO Jack is a decent player, nothing more, and if we were offered £4m for him, I'd be willing to bet that our management team would be more than happy to accept that offer. The stumbling block might be Jack himself not wanting to move.
*that we know of