The way I see it, Bethesda seems to have tried too hard to overcome their weaknesses with Fallout 4, and while their efforts were (in my opinion) mostly successful, I feel that somewhere along the way they put their strengths on the backburner.
Combat for example is much more polished than it has been in previous games. The story as well (although this is purely subjective) is greatly improved over Fallout 3 in my opinion. In fact, even if you weren't a fan of Fallout 4's story, you could tell they put more effort into telling a story this time. Companions are more fleshed out over 3's and respond to your actions, which is clearly evident.
However, their previous strengths don't seem quite so, well, strong in Fallout 4. Roleplaying, although more of a focus in TES, has obviously always been integral to the Fallout series. Although the character you play usually has a set background, you could shape their personality to be however you imagine it to be. Voice acting, while well done and despite the fact that I've defended the decision to include it in the past, can in many instances damage the story that you're trying to weave for your character.
Builds, as mentioned in the article, aren't as distinct from each other as in previous games. This may be due to Bethesda's disposal of the skills system or due to energy weapons benefitting from the same perks as their ballistic counterparts.
Another point mentioned by the article is the relatively small amount of quests. While normally I'm a member of the "quality > quantity" school of thought, the small amount of quests plus the lack of distinction between different builds add up to doing the same quests over, and over, and over, etc. While I replayed quests all the time in Skyrim, I played through them differently if I was building a conjurer as opposed to, say, a berserker. That choice of using two completely different playstyles is barely there in Fallout 4. Yes, there's melee and non-melee. But in Skyrim I could choose to be an illusionist, an archer, a spellsword, a thief, assassin, etc.
While these faults do add up, I still love Fallout 4. But for me, and I can only speak for myself, Skyrim has more staying power. Even so, I plan on playing Fallout 4 for years to come.
Just my two cents.