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Well, first off, keep in mind that Necrons are one of the current 'top tier' power armies, hence they're rather popular right now... They're not quite Eldar/Vanilla Marine/Tau levels of popular, but especially in their Decurion formation, they earn you very few friends. Think of them as being the 40k equivalent of the 7th ed Vampire Counts "Dickenhof Guard" style army.
On the other hand, both Guard & Tyranids are currently among the bottom feeders in the game in terms of raw power, with Tyranids being the better of the two *IF* you play the 5x Flyrant list 'o doom.
Guard tend to be looked upon as being the second most fun/rewarding army in the game next to Orks. It's basically THE underdog army in both the background and game itself, as the individuals that make-up your force are just basic human dudes in a galaxy of insane horrors.
They look and feel very similar to The Empire in Fantasy. Individually their units suck. But when massed together and boosted by their officers & other specialists such as Commissars/Priests, they can become much scarier. (still not scary though compared to the 'Big 4' of Eldar/Vanilla Marines/Necrons/Tau)
Tyranids are troubled as being the assault army that can't get into assaults, AND, being a psyker heavy army that has the worst psykers of the psyker heavy armies.
Still, both 'Nids & Guard are rumored to be likely getting new codices in the new year, so now could easily be a great time to start on collecting them! (unlike Chaos currently, who are looking like they've been 100% forgotten - especially the poor Chaos Marines...)
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