Open by default
Dutch football's coaching culture pushes teams towards playing through the pitch rather than sitting in a block, and when both sides try that the result is a match with space in it. You get more shots, more transitions and more mistakes than in leagues where the priority is control, and mistakes are what neutrals are actually watching for.
It is not always high quality, and nobody should pretend otherwise. It is almost always eventful, which for a viewer with no emotional stake is the better trade.
Young teams are more interesting
Because clubs sell early, the eleven you watch is unusually young, and young teams are volatile in an entertaining way: brilliant for twenty minutes, naive for ten, capable of losing a lead they had no business losing. You are also watching players before anyone has decided what they are, which is a pleasure that disappears once a career is settled.
A season later, half of them will be somewhere more expensive and you will already know their habits.
The title objection
The obvious complaint is that a small group of clubs wins everything. That is true and it matters less than people claim, because a neutral is not invested in the destination. What you want is good matches, and a league where the strongest sides attack rather than manage games produces plenty of them.
If you need suspense at the top of a table to enjoy football, this is not your division. If you want to spend an evening watching a team try things, it is one of the easiest recommendations in Europe.
What you give up in exchange
It would be dishonest to sell the league as flawless. The gap between the strongest sides and the rest can flatten a title race, and European nights can be a blunt reminder that budgets elsewhere buy a different level of resistance. Anyone arriving expecting a month-by-month championship fight may be disappointed.
The trade is still worth taking. You get football played forwards, teenagers given real responsibility, grounds that sound full, and kick-off times that suit a Sunday afternoon. For a neutral choosing something to follow rather than something to argue about, that is a better deal than a tighter table played more cautiously.