Really? Transmutation is normally thought to be the worst
Just to level 6 for the stone. After that it is pretty
meh.
But that is the issue with most of the wizard subclasses. IMO only abjuration and divination are really good at all, just because of spell resistance and greater portent.
I agree there should be a generalist. There's war and scribes currently - and I think scribes is only a slightly gonzo take on the generalist.
I haven't looked into scribes (in Tasha's?), but I am not surprised if it is OP at all, much new material is IMO.
War is also decent to start, but like the others is underwhelming. Of course, given how powerful wizards are in general, their subclasses really don't need to be very strong.