My view is the opposite. Personally, I think a lot of the 5e art looks like garbage, where as the art from Pathfinder looks great. Certain artists in 3rd edition that WotC employed I absolutely hated (Crabapple and England), but there was a bit of good art. I liked a lot of the art in both editions of AD&D, but like billd91 said, some of that art looked cheap and bad. My opinion is that Pathfinder's art has been 90% awesome, where as the non-landscape art for 5e looks like crap. Most notably: the Halflings in the PHB, and the various giants in the MM.
Good art is in the eye of the beholder. The quality of the art from AD&D, both 1e and 2e, was uneven and, in many cases, pretty cheap-looking. You may not have like the style of later editions, but I'd say that the overall consistency improved considerably over the years from TSR's earlier days to now. That may mean that, if you don't like the style, its consistency may work against it - in your eyes.
Good grief. 3/3.5 e had what? 10 hardcover, full color books per year? There's a mountain of 3e art and a lot of it is fantastic. I've never understood the nostalgia glasses that people insist on wearing when looking at older stuff.
I'll stack the 3.5 Tome of Magic art vs pretty much anything published before that. That is one gorgeous book.
All art is subjective and tied to opinions.
That being said, some of the artwork for 5e monsters is so much better than previous art, in my opinion.
Bodaks are a big one for me. I remember seeing bodaks in 3.5 and thinking "Why are there weird aliens here" and they never seemed scary to me, just Grey's with bigger bodies. 5e Bodaks though? Those things are creepy and cool and I love them.
I think I also prefer this editions dragons, even though frankly the best dragon art is never the DnD dragon art.
I have 60 AD&D books and around 80 3.x books on the shelf. When I think of meh to bad 3.X art I mean things like the Complete series, the class books, Epic Level Handboook, even the 3.0 core books.
The best 3.x art is the monster books like Draconomicon etc. I still find the interior full page AD&D 2E colour art better than most of the 3.X stuff.
My dislike of Pathfinder art is mostly the WAR stuff- core rule, Pathfinder II, the Ultimate series ettc a lot of the APs have very nice covers. I also don't like the WAR 4E covers and most of his stuff in 3.X as well altough I don't mind his The Dragon 4E Darksun cover that is not to bad.
Overall the 5E books are the best looking and most consistent but I still love the best of the AD&D era say mid 80's to mid 90's type stuff which I find better than the best of most f the following editions although 5E covers do give them a good run for the money like XGtE.
With that number, I'm assuming you're lumping 1e and 2e together.
The fact that you're focusing on some very, very early 3e books - the Complete books, Epic level Handbook, and Draconomicon, seems like you're being pretty specific here and ignoring any 3.5 books. None of the examples you listed are 3.5. Did you skip 3.5?
Because, again, I'm here to tell you, as pretty as some of the 2e art was, it doesn't hold a candle to the latter era 3.5 stuff. Or even come close to 4e art. And, frankly, while there are a few misses in 5e (looking at you halflings), the 5e art has been bloody fantastic for the most part.
With that number, I'm assuming you're lumping 1e and 2e together.
The fact that you're focusing on some very, very early 3e books - the Complete books, Epic level Handbook, and Draconomicon, seems like you're being pretty specific here and ignoring any 3.5 books. None of the examples you listed are 3.5. Did you skip 3.5?
Because, again, I'm here to tell you, as pretty as some of the 2e art was, it doesn't hold a candle to the latter era 3.5 stuff. Or even come close to 4e art. And, frankly, while there are a few misses in 5e (looking at you halflings), the 5e art has been bloody fantastic for the most part.