Just finished it 100% and I have to say, I'm very impressed.
I'd say that A Link Between Worlds is the best Zelda since Twilight Princess, certainly the first one in seven years that hasn't been disappointing in any way. The game is simply beautiful, the music is astounding, the secrets and puzzles are enough to make you think but not too much to get you stuck, there are a lot of things to find and collect, the mini-games are genuinely some of my favourite from the whole series, the wall merging power is used well and used often, and the ending is just pitch perfect.
There are a couple of areas I feel the game could have done better in but they aren't really things I would change. For example, the dungeons are fairly short; however, this can be overlooked because of how well designed they are and how interesting they are, too. The Dark Palace was incredible and dungeons like the Ice Ruins, Desert Palace, and Swamp Palace all had really interesting ideas as well.
Having all of the major items available from the beginning meant that there was less to look forward to when opening chests in dungeons and, since I rented them all immediately and never died, meant I had an easy time of it, combat-wise, until enemies appeared that could match up to a fully equipped Link. Again though, this meant that the dungeons could be tackled in any order at all, something that has sore been missed from the franchise. On top of that, it's balanced out a bit by how traversing the overworld and finding secrets is limited in other ways, for example the giant boulders which require the Titan's Mitt. So the upside outweighs the downside while giving this game a bit of uniqueness as well.
Overall I'd give the game a solid 9/10. It's the best Zelda for the better part of a decade and I'm excited to see where Nintendo go next.
