I think its a difference of opinion between tac-com regulars and UK tournie regulars. I really do think its an awesome unit, well worth the almost two thunderhawks it replaces, especially with the fearless/aircraft/losing assault errata/faq/whatever it is.
Surprised people use it as the BTS though, that's lists with terminators with chaplain/upgraded tacticals?
And its great with white scars - full termie formation with land raiders backed up with the 4 stands of your choice (in blood angels I would be tempted to use furso dreds and make sure they took as many hits as possible so they can die and not slow me down

).
With White Scars they are a hoot, admittably 1225 for terminators, land raiders, assault marines and two chaplains, but I don't think you can get the same punch with any other list, though Blood Angels can have something involving death company and 2 lots of scouts for cheapness, or something with more bite like tacticals, 1 extra vehicle and a dreadnough, black templars get to fill the odd space left when using bikes and tacs with a scout and any list can play with the oddity of 3 lots of assault marines with 6 vindicators.
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