It's the second-worst Macharius variant - sure, the Vanquisher cannons are neat, but the Omega and Vulcan are much better.
Other chassis-sharing vehicles are better: the Gorgon transports a fuckload, the Crassus is a well-armoured party bus and the Dominus is a neat triple bombard. The Preator isn't as cool (unlimited ammo though), so I guess it can make a case for only being the 3rd worst vehicle on the chassis
Then there's all the Baneblade variants, which are all better than it, but those are rarer (in fluff anyway)
The other smaller imperial superheavy chassis is worse, at least in the 41st millennium (the ones in the SM legions were cool though), so it has that going for it, though aesthetic choices are subjective - the Malc is a lot more love it or hate it.
Again though, a lot of the variants are cooler and better, especially if you include the Dracosan in those
Overall 5/10, it does the job but there's a lot fo better and cooler stuff in the imperial arsenal of superheavies.