The writing itself isn't bad. Sure Claremont gets higher praise due to the notable storylines he came up with but he also has his blatant lesbian fetish he kept trying to shoehorn in to every X-Men series he got his hands on.

Mystique and Destiny [With Mystique literally shapeshifting into a man to be Nightcrawler's father instead of his mother]. Shadowcat and Prestige [Rachel Summers]. Bling. Betsy Braddock. It goes on and on and it's always Claremont trying to push it. Bring this up and it just gets washed aside as "anti-woke" nonsense which I would perhaps entertain if it was Marvel as a whole doing this but as mentioned this all comes from just Claremont.

The issue with the earlier issues is the format more than anything. Far too much text per page since every panel has something being said. Art isn't great but then sure that's something that can be improved most of the time as things go and there are worse examples out there from later on in Marvel history anyway like with Larroca and Land.