Yeah, the Nova Prime is always a bit like a Lamborghini: it looks really cool, and its got impressive numbers so you want to take it, but it costs so much no one can ever afford it and when they finaly get it, they find it over heats at the drop of a hat and doesn't really handle that well.
The Nova S admittedly fixes most of that. I guess like like the Nova Gallardo. And the H is really good value, even if its a bit more like a big muscle car of a mech with nothing but power, power and more power (100 potental damage, and little hope of ever doing more than 30-40 thanks to heat and accuracy problems).
That said, I like all three of thouse models in their own ways. A lot of people under estimate the Prime since 1) they never see it and 2) it's legendarialy inefficant, and it bits them hard. Despite having only 'medium lasers', its solidly in the medium range at 15 hexes so between that and its speed its tricky to out range it if its well handled, even for something like a Summoner D or Stormcrow Prime that you'd think would have a field day. And oh the power! Even factoring in a few misses, it will still hit with three to five MLs a turn, which adds up faster than you think, since each hits 70% as hard as a large laser, and most mechs don't have 70% as many large lasers to shoot back with.
No one ever underestimates the S. Everyone knows pulse lasers rule the game, and putting them on a nimble mech with solid heat dissapation is a recipie for success. And no one under estimates the H, since it really is as problematic as everyone thinks it is unless you're playing against the IS, and IS players know how to handle mechs with a lot of weapons that hit hard out to nine hexes. Though it is good value, and a good way to fight wall of steel type forces since their low speed and high armor plays into its low accuracy and high damage, with its value and manuverability being a nice tipping point if you're clever about using it. Classic Lyran forces with a lot of mech and not a lot of skill are easy pray for that or any Nova.
As for the others... the A and B are pretty usable, and the D is a great value mech, with the LRMs doing good work for pure damage, but they're not really the same sort of sillyness. The E and F are also pretty good (nice mix of the ML spam and some other big guns) but you actualy pay for what you get, so they're nither 'value' choices nore 'crazy' choices.