Not really sure why Endura Deluge get the odd bad review, they’re great winter gloves IME. OK when it gets 5c or below I need to use a merino liner as well but that’s true of the 3 pairs of Sealskinz, some Madison ones and some others I have that the brand escapes me. The only ones I have that are warmer are the Spesh sub-zeros but then only if you use both layers and they are far more bulky.
Personally I think merino (or silk) liners are the key but as an outer glove the Deluges tick all the boxes for me (gel padding, not bulky, pretty waterproof, easy to get on and off, long cuffs, not hideously expensive).
I think if I rode a lot in sub-zero temps I’d probably switch to lobster-style mitts but used to use them donkeys years ago and they’re pretty bulky to.