Bri, few thoughts.
1, shouldn't be an issue, I've moved over 8 people in the last 16 months to Fibe, most has Samsung TV's and they all agreed it was much better then VT.
2, Unfortunately, you need the TSN/TSN2 theme pack on top of the channel, most people opt for the 4 pack of themes, this is only the case for TSN/TSN2
3, CC is an issue, I would call back in, and press the option to go to billing, then ask the billing people if they can forward you to level 2 support. Level 1 support isn't generally located in Canada, and it will be hard for you to reach someone that will understand the problem. Bell has the ability in Mediaroom to give you the same options that VT had regarding CC.
4, (I don't have COD here on my PC) There should be a setting somewhere to redownload the list of servers, it will generally show you the closest and fastest servers, of course this will change when you switch ISP's, you need to redownload that list, you can also try changing your computers DNS servers to 18.104.22.168 and 22.214.171.124 and see if that makes a difference after a reboot.
5, Agreed, it's a huge piss off for me as well.
6, This is normal until your account is fully setup, may take a full billing cycle.
7, There are 3D Rentals, they are few and far between, but they are there for sure, and there are channels up from time to time, 3D golf I've seen pop up twice for a weekend.
8, Agreed as well, I had to put a clock in my livingroom for this reason too.
On the Videotron front, if you opt for that, might want to checkout Electronicbox, very solid ISP, in fact you can move your net to them and stay with Bell anyway, they use Videotron for the last mile, and the connection is always good.
On the 3D channels and rental front, if it's up for free, like the gold stuff has been, it's worth it. As for renting a 3D movie from PPV or the rentals, IMHO, I'd not do it, I'd just rent them and watch them via bluray. 3D provided by all PVR's is SBS and highly compressed, for the amount you're going to pay for it, rent it from a superclub for the same price and get 10x the resolution.