Well no, that's patently false and a reductionist way to enter a discussion. Whether you like him or not (I don't), Fellaini is a player who has given the opposition far more to think about than Mata has in his time here, been utilised in many a donkeyish way as an important conduit we've utilised time and again and has enabled others to play. If you're going to be objective, you take that into account. If you're not, then you make your own view redundant.
Well, yes. It's spot on and sums up the underlying cause of many of the views very well. I mean, it's redundant to cry foul over objectivity when you aren't privy to whether I have taken that into account or not. PS - I have.
Look these things do play a part in people formulating these views. You're taking it rather personally whereas it's only natural to feel that way.
As for the actual point raised, Fellaini has often made an impact for us and effectively being used as a tool to force opponent to feel uncomfortable. However this is clearly interlinked with him being a "Plan B" or "Curve ball" thrown by is at teams which sometimes works and sometimes fails. It does not inherently mean that he's better than a footballer who isn't a curveball, and a slam-bam impact does not always mean a better contribution. Peter Crouch also made teams think differently but that doesn't necessarily mean players who didn't, were necessarily lesser contributers/of lower importance than him.
All in all, I do like Fellaini's mentality and appreciate the odd times he allowed us to shock our opponents, but the downsides of his game were far too significant. On the other hand, while Mata was disappointed he operated on a much standard rendering the comparison rather pointless. Even a disappointing Mata, for me, comfortably beats Fellaini.
On the 'donkey' point, let's be honest here. We didn't 'misuse' Fellaini like a donkey and that's the actual point. His best qualities fit that style of play and this is clear to everybody who watches him play. The rest of his game is far too mediocre for his best utilisation to be of any other way. Not that it didn't help us, but let's not pretend he's had to deal with any sort of mis treatment. His actual midfield play is absolutely terrible. His SS/disruption play can be effective.