What I have found about MVP is pretty much what Sky is saying; my Viera and Moogle both have 3-5 pieces of MVP towerness while the rest have 2 or less. Heck, one is a red-mage/white mage and the other is a thief, so not doing as much.
Turn order, I first thought as "ghost" image of a charachter sometimes. Now I know that it is the place that the charachter will end up without doing anything. Not really helpful, but not really hindering either. But I agree with Roto, it is a large step for any tatical game i have played. Really been getting my manuevers pulled off nicely with that addition.
Beastmasters, I also noticed that changed. Meh, I only ever used them to up my Blue Mage, so indiffrence from here.
Really, I haven't seen much hindrance from the new MP system. Usually my mages aren't close enough to the enemy anyways (safely, i mean) until they have 20-30 MP. I guess they put it in so you couldn't just Illusionist it up like crazy from the start for an easy win?
Lastly, I found an easy way for Bazaar items, with little impact on your charachters. As long as you want to put in some time, just do the Clan Trials! You get clan privileges at every other rank (1,3,5) so what I did is just get all the clan priviliges that i could as soon as i could, (got about 10) and it opened up a ton of items for me. Might of just gotten lucky, but it might help some people out.