Absolutely love Valheim, would rate it 9/10, maybe 9.5/10. Was hoping LOTR Return to Moria would be something closer to Valheim in quality of crafting, base building, exploring and co-op play, but it isn’t anywhere close to Valheim in its 1.0 version.
For example: My co-op group built a couple massive bases in Valheim to use as stepping stones to explore the wider world, plus many smaller forward bases. Valheim also allows you to create portals between bases like LOTR RtM, but you can’t take the most important crafting materials through a portal. Have to actually sail the materials back to your main base or build a new forward staging base with the forging equipment in Valheim.
Valheim also has far more crafting and base construction options than Return to Moria. We overbuilt a lot of stuff in Valheim simply because it was fun and looked cool. LOTR RtM isn’t delivering anywhere near the same incentive to build things for the joy of building.
Another example, exploration differences: In Valheim you have a wide open world to explore, where some biomes are far more dangerous than others, so you dodge around these higher level areas while sailing until you’ve progressively geared up you equipment. LOTR RtM has some elements of RNG map generation, but mostly the path to higher difficulty encounters and materials are gated by non-RNG encounters and fixed map sections.