Neymar is rated highly by almost everyone though even those that dont like some of the ways he behaves.
Even you as one of prime Ney haters have said he is one of best in world.
Those Inter fans are very mixed on what he brings to the team, far more so than anyone on here with Neymar.
No idea how that poll ended up like that going by the comments. So it proves nothing other than its not the general feeling of the fans.
You have to take into the account that their fans are bitter because their team plays poorly.
They were one of the best team in Europe for 20-30 years, and now they are out of top5 in Italy.
So, when fans are angry and disappointed, they will more often say bad or have mixed views on their players who are "guilty" for bad results.
For example, imagine that the current Barca finished 3rd or 4th in La liga, and that we won zero trophies for 2-3 Seasons.
Do you know how our threads would look like:
1. Messi
-- he is past his prime
-- sell him
2. Neymar
-- lol, a dissapointment
-- bought for 100 Millions and brought zero trophies, sell him
3. Suarez
-- paid 80 Millions so that we can finish 3rd
4. Iniesta
-- past his prime, sell him
5. Rafinha
-- he is the reason why we finished 3rd. We can't play with such an average players
6. Pedro
-- sell him, he is such a crap etc
You get my point.
Inter is poor, Seria A is weaker.
But Kovacic is one of those players who have high chances to easily turn into a next Iniesta, Modric or Isco, if he slightly improves and if he gets a chance in the biggest teams like Barca or Real.
We can't know that for sure:
1. until we buy him while he is cheap
2. or until someone else buy him for cheap, and he will then either explode and turn into a 50-60M player or he will flop
Imo, Isco and Verratti were equal as him when they were bought (on a similar level).
Now, when they improved further, they are out of our reach forever.