It still dumbfounds me that Live Tile support on Windows Phone is still so incredibly bad. It is one of the main selling points and coolest aspects of the OS IMO. I had so much trouble on my Lumia 900 with live tiles. I was literally only allowed to have 3. If I ever put a fourth on my start screen, they all would completely stop updating. I never really heard about anyone else having this issue.
Now with my 920, I dont have this issue anymore, but still many professional companies make apps with subpar live tiles that look like junks and never update properly. Literally if someone made an app with a large weather live tile. that had a whole bunch of current conditions on one side, and when it flips shows the 3 or 5 day forecast, they would prob be a millionaire. That is a shame.
Also, as mentioned above the Bloomberg app is trash. Is there specifically any apps that are better for stocks on your live tiles? I
As Nokias ESPN app does nothing on my live tile. Its live tile description is not very good, but it seems like any of the teams you set as "My Teams" scores should appear on your live tile. I have it enabled and choose a whole bunch of teams across many sports. And the live tile does nothing. It just says ESPN, doesnt flip, doesnt show any scores.
Back on topic for the OP though, I am kinda of a weather nerd (I do work for NOAA) and two weather apps which I have had good experiences with are Nokia Weather Channel app. Its current condition has updated 100% for me (about every hour) for a week now. Worked great on my Lumia 900 too. Thought it is lacking a large tile. But honestly I see most peoples start screens and they dont even use big tiles because they take up so much space. You can only fit 3-4 rows of medium/large tiles on your start screen. One large tile means you are sacrificing 16 small tiles.
Also, the app called "Weather Radar Tile" show an up to date live tile showing the radar image for your region (either a set location or it can follow you!). While I know other apps show radar images, this ones is better in a sense that it shows the NWS radar image. Other apps like the weather channel show a hybrid composite image which doesnt really tell you what is actually reaching the ground. Only works in usa though.
People tile is also decent large, but it doesnt seem that was the answer you were after.
Otherwise, havent found any great live tiles that work.