100% I feel that you can compare those films to US films of the same general timeframe, and they sort of hold their own and stand up. Once the 90s hit, it just felt like the production value and cinematic quality of the Godzilla films just seriously lagged behind similar US films of the same era.
Although Destoroyah would be the next one after them. By then, Okawara had developed a bit more of a cinematic eye(although it was best in G2K). Considering everyone involved knew it would be the final Godzilla film for a while and that Godzilla would die...I think that film benefitted from those involved bringing their A-game.
It is still a little uninspired in some places, in terms of visuals and cinematography, but there are plenty of places where it really works and feels more like cinema and less like TV.
But yeah, the 1991-1994 films are fairly brutal in a number of facets. Weak scripts, cinematography, production value. The films are colorful, have great music and lots of lasers, and generally I dig all of the creature designs, but not much beyond that.
If there were a way that going straight from Biollante to Destoroyah made sense, continuity wise, I'd embrace it...but alas, the presence of Junior requires that GvsMGII be watched, which requires that GvKG be watched...which requires the viewer to buy into a terribly executed bullcrap time travel plot.