Disagree, its great in practice too. Of all the full casters, Sorcs are the most limited, being stuck with a incredibly small 'spells known' list, and being restricted to that for most of their adventuring career. Wizards can learn more spells, and prepare a different set of spells each day. Clerics and druids know all their spells and can prepare any of them each day. All of them, even warlock with the right options, have ritual casting, that alone beat the Sorc in terms of utility. The Wizard is a master at ritual casting as he never need to prepare them and can cast them at will. The only saving grace for the Sorc is Twin Haste. It will make the Wizard jealous for a while, but then he remembers he have Leo's Tiny Hut and can rest whenever and wherever he wants, Find Familiar for scouting and Assist cheese, free walkie-talkies for his team with Telepathic Bond, all without using spell slots. And Haste too if he wants. Meanwhile, Sorcs are stuck with 15 spells max. You name a spell the Wizard don't have, he can learn it up in a few days.
Metamagic is overrated, because most spells can usually do 1 or 2 things, and metamagic doesn't change that. You have 15 spells, you can do 15 things. Wizard have 50 spells, they can do 50 different things. They literally have a spell for each problem. Also, you only get 2 Metamagic options before 10th level, and a very small pool of Sorcery points. Most of the time, you will wish you had the Metamagic that you didnt take, but Twinned is too good to pass up. That leaves room for one more between Quickened, Empowered, Subtle, Heightened. They are all good, but you can't have them all at the same time.
In fact, people have already tried to figure out the OP things they can do with Twinned abuse, and its usually involves spending massive amounts of SP, like Twinned Disintegrate or something. I'd like to hear what other OP things you can do with Twinned that others haven't figured out yet. But if you're still not convinced, look up the Simulacrum spell.