Especially if you know why it sucks you can work around the suckage; but 99% of everything sucks, so if you don't know why the new shiny thing sucks, you're gonna have to find that out yourself, under fire.

(This can even happen between various old and established things; if you know MySQL and all its warts well, perhaps switching to the relatively unknown PostgreSQL "because it's better" isn't the best use of your time. You should be able to explain why and why not before making the switch. When in doubt, do what everyone else is doing - unless it's your differentiator.)