To me, Those seams look solid. But, I'm still working on my first build.
I have 95% of the parts printed and I began assembling. Glue, Epoxy, Welding, and I will go back and add some hot staples in a few places for good measure.
The good: Welding is easier than I expected
The Bad: I have a lot of parts that could have been printed at one piece. Like the Front Chest. One of the breast plates could have been included with the Main underbody & the sleeve gasket. The other breast plate with the front collar and another gasket part. That would be 6 parts printed at 2 parts, assembled with a long complex, easy to brace, seam.
It's all part of the process.