"It doesn't feel like Trek to me" is a legitimate criticism, whether newer fans like that or not.
But the locus of that sentence is "to me".
"Stop expecting our standards to conform to yours", however, is a legitimate counter-argument to that criticism. It's not satisfying to the old guard, of which I am a card-carrying member at times, but it's valid.
The problem I see is that the old school cannot accept that ... no pun intended ... the next generation doesn't feel bound to honor (or even respect) what their forebears felt was somehow sacred, while the avant-garde sometimes falls into "change for change's sake" and on occasion throws out the baby (Klingon) with the bath(leth) water.
I like The Orville. In some ways, I like it more than Discovery, for the reasons above and others far subtler and nuanced. But it's so much a pastiche of Star Trek: The Next Generation that Paramount, in my opinion, could absolutely have stopped it in its tracks with a lawsuit if they'd wanted to do so. (And yes, I've read an attorney or two [including our much-respected LStyer] asserting otherwise, but I've also read lawyers agreeing with me, so ... let's not go there in this conversation.)
But perhaps they realized, in what constitutes from my perspective a stunning display of maturity and farsightedness, that letting both The Orville and Discovery have their audiences satisfies more people than condemning either does.
I once watched Siskel and Ebert debate the merits of a Godzilla film from the Showa period. Gene, God rest his soul, attended church at Our Lady of Just Don't Get It. He went on for a time about all the obvious flaws of such a film, while Ebert waited patiently. When his counterpart was done, Roger shook his head and said something to the effect of, "Gene ... this is not supposed to be Olivier in Othello. If a film sets out to do something, and succeeds, it's a good film. I don't go to see Godzilla movies for high theater. I go to see Godzilla show up and kick the crap out of another monster that's threatening the Earth. That happens in this movie. Most kids and some people who are kids at heart will like this film. THUMBS UP."
You're not morally superior if you prefer The Orville to Star Trek: Discovery.
You're not more evolved if you prefer Star Trek: Discovery to The Orville.
If you believe either, you're a pretentious ass.
One man's brilliance is another man's blasphemy.
"If CBS thinks I am going to pay to watch Star Trek, they are demented." – Marina Sirtis