Those of us who enjoy the Elder Scrolls series were surprised to see the next game after Skyrim would be an MMO. Oh well, it's here. We probably would have preferred to have a co-op, but we should make the best of what Bethesda is giving us. I'm sure it's a fine game in its own right.
From what I'm hearing though, many aren't enjoying the dungeon crawling while others are around (They're not referring to the open world environment, or the group instances, they're talking about individual dungeons.) That makes sense because of it feeling very much like an Elder Scrolls game, and Elder Scrolls isn't an MMO series.
A possible solution to this, would be to phase out individual dungeons for you and any group members you have (however you define a dungeon). Keep the open world with tons of people running around; keep the group instances; keep the PVP (when it comes); keep the MMO portion, but add an element of co-op.
Spelunking is a special part of every Elder Scrolls series, and should be kept similar to how its been in the past. It made the series feel special and unique, and I'd like to see this game have an element of that uniqueness.