But, there's some really simple places VS drop the ball which cause these sorts of reviews - things which aren't hard to achieve, and would keep the punter happy.
Filthy dirty planes, which are worked so hard that there's little or no chance to recover from delays, minimal opportunity to fix cabin defects, and everything falls apart when an aircraft goes tech.
Penny-pinched scrimpy food and service, with the new PE service being the possible exception. The J food has gone down the pan (reduced choice and poorly executed meals), and the Y service has been cut back (the dreaded shortbread and cardboard drinks, for example).
Inconsistent service from the crews. Some are fantastic, deeply professional, and appear to care about what the pax think. Others simply couldn't care less about the pax and worry more about what they might be doing on layover. It wouldn't hurt VS' image to have some slightly older and more mature people among the cabin crews, to help keep the "kids" in check.
Replacing experienced, dedicated and familiar permanent staff at downline stations in the US with minimum wage contractors, in order to cut costs, who have only rudimentary understanding of VS operations and procedures (and a similar grasp of English if one of Skytrax correspondants is to be believed).
Bits of the advertised service which just don't happen, such as Priority Boarding or Priority Baggage.
"Bozo bugs", such as food and drinks, special meals, etc., not being loaded.
These are really simple, easy things which VS seem to have trouble getting right. If VS could focus on simple things like clean planes, I think a lot of the grumps would go away.
Mike