Now I'll be the first to admit that from a balance, fun, gameplay aspect "spamming" units (which seems to be defined as 'more than two') is a negative thing. However, from an aesthetic point of view I dislike the chocolate 'sampler box' style army lists. The ones where no two units are alike.
To me these lists are like an army consisting of 1 blackhawk, 1 apache, 1 abrahms tank, 1 infanty squad in a hummer, 1 infantry squad on foot, 1 infantry squad in an APC, 1 howitzer, 1 mortar team. You'd never see a force like this in the field. Units tend to use the same equipment and vehicles for repair and resupply purposes if nothing else.
Now I field armies some would call 'spam-tatstic' but for me they have an [URL="http://dictionary.reference.com/browse/aesthetic"]aesthetically[/URL] balanced feel. A kind of [URL="http://dictionary.reference.com/browse/feng shui"]feng-shui[/URL] that may be unique only to me. For example:
3 tactical squads in rhinos
3 dreadnoughts in drop pods
3 landspeeder typhoons
1 terminator squad with terminator librarian
or
3 tactical squads in rhinos
2 land raider redeemers
2 assault terminator squads with terminator chaplain
or
Pedro Kantor and Librarian
3 sternguard squads (two 9-man and one 10-man) in drop pods
2 sniper scout squads
2 devastator squads in drop pods
or
1 commisar lord
4 veteran guard squads
3 armored sentinels with plasma cannons
3 scout sentinels with autocannons
2 standard leman russ tanks
1 leman russ executioner
Even if you don't agree with me, can you see what I'm saying?