It's not about what I like, it's about what I loathe. The loremaster is the having your cake and eat it too of the arcane casters. The loremaster takes quite powerful metamagic -a lot of it on par if not outright better than the sorcerer- and plugs it onto the wizard chassis, which is stronger than the sorcerer's. Spells known, sky is the limit. Spell variety, lots of exclusive spells. Spell slots, in abundance. Ritual casting, the second best in the game.
This one subclass erodes completely the sorcerer niche. A lore master is going to be way way better than a same level sorcerer, perhaps even a sorcerer of three or four levels higher. And since you are not picky like me, and have been playing your current sorcerer/warlock as wizard lite, there seems to be nothing unique the sorcerer class can offer to you. The lore master is broken; I don't think most DMs would allow it, but since yours seems to allow it, don't let the chance go away. He or she will hate you for it, but that is a once in a lifetime chance.