Is whig history generally considered to be 'bad' history?

The theory of history, that history is a linear progress to perfection (generally) or bourgeois liberal society as exemplified in the United Kingdom (specifically) is easily disprovable.

For example, the relationships between people in what is now Western Europe sank from legal reciprocity to armed violence as Rome slowly morphed into the Germanic kingdoms.

For example, out of a state with codified laws, Mussolini's fascism emerged with its systematic paralegality.

On top of this critique, that whig history isn't tenable as it is demonstrably wrong, whig history contains the theoretically suspect category of "progress," which is necessarily ideological in form. To claim as transhistorical (ie: as the universal justification of all historical processes) a particular ideological outcome is not just teleological, it is also anachronistic: whiggery didn't exist during 500BCE.

Finally, some use "whig history" to point to any teleological historiography, such as Marx's teleos for example. Teleos in Marx isn't determinate. In the determinate transition to feudalism, there was no further determination of capitalism or socialism. The bourgeoisie were a side effect produced and reproduced by feudalism. Unlike whiggery which postulates a universal and determined project; Marx's description of history's past determination is merely that, a description.

Teleology is often used as a criticism, but it doesn't have the force of suggesting someone's history is a whig history. There are circles in which teleological histories are still acceptable, as long as the teleology is demonstrated of course. There aren't circles where I've seen whig history accepted, but this does remind me to suggest to friend that a non-historical discipline they're involved in is playing in the filth of whig history.

In specific relation to Marx's teleology (at various stages), let's consider 1847's Poverty of Philosophy at chapter 2:

M. Proudhon the economist understands very well that men make cloth, linen, or silk materials in definite relations of production. But what he has not understood is that these definite social relations are just as much produced by men as linen, flax, etc. Social relations are closely bound up with productive forces. In acquiring new productive forces men change their mode of production; and in changing their mode of production, in changing the way of earning their living, they change all their social relations. The hand-mill gives you society with the feudal lord; the steam-mill, society with the industrial capitalist.

The same men who establish their social relations in conformity with the material productivity, produce also principles, ideas, and categories, in conformity with their social relations.

…

There is a continual movement of growth in productive forces, of destruction in social relations, of formation in ideas; the only immutable thing is the abstraction of movement – mors immortalis.

Marx's determinate category here is pretty close to a technological determinism, and there's a sense of teleos in the movement of productive forces. But there's no indication that the hand-mill produced capitalism, any more than the steam-mill produces socialism. The hand-mill produces a new instance of social relations whose unique character changes what comes next. The society of the hand-mill can't comprehend industrial capitalism, and nor did it produce it. Apart from the universal of movement, there's no determination linking as a necessity Society A to Society B.

The kind of reinfeudation and mass slavery seen in Federici's Caliban and the Witch as just as likely as free wage labour appearing in the European bourgeoisie's slow contest with the aristocracy. I suppose that the Varieties of Capitalism discourse follows this up more closely.

I will agree, however, that Diamat as taught in the Soviet Union, and on history in particular, taught Marx as determining a universal course of human social change.