Taryn Manning is always a delightful mess as Mary. She's terrible, of course, but she's so terrible that it is kind of funny. You know, like, "Hey, check it out, they're letting Taryn Manning be on TV again! On a show watched by millions! They're not even forced to do it! This was their idea!"
Damn, Tani looked good in that dress. I mean, daaaaaaaaaamn.
I totally feel you in general, @ganesh, but I think it's fair enough to note that this stuff DOES happen all of the time and it's not like they rushed into it. Plus, 5-0 has been on the air for roughly 326 seasons (roughly) and this is only the second time they've had two of the team members get together (Catherine doesn't count, since she was made part of the team after she was already dating Steve) and the other example (Abbi and Chin) is a bit of a stretch since she was only a temporary member, so platonic relationships have been the rule more than the exception up 'til this point (especially with Lori and Steve, which I really liked how they kept them platonic), so I think it's fair enough for them to make an exception now.
That said, did they seriously get them together to the same song that Tim and Dawn got together to on the original Office? That's....odd.