I like messenger for Mac! I think It's great that all the annoying features never made it to Mac, so noone can send me "a wink" or what not - I'm using microsoft software and is free of the typical microsoft "we'll make it as annoying as possible too use your computer" stuff...
for voice and video I've got skype, I never used the video or voice thing in messenger on PC, because I thought skype was better! I don't even want all my contacts in messenger to be able to do a voice or video conference with me because so many people I don't really know is on it! I think messenger for mac is perfect as it is now!