Xhonzi - I had similar frustration until a mate commented that there was a control scheme more in line with what I was used to - called 'recon' - I've found that to be much better with my 'halo 3 fingers / muscle memory'.
And yeah it will be interesting to see how things play out. It seems they are trying hard to please both fans and those that drift off to other shooter games.
005 - yeah I'm in and so far it's been quite fun, I too get zero enjoyment from the COD games - but generally playing Halo I can have a good time, even if i'm losing. It's always good to win but I'm more for having a good time than being competititve.
At the moment there's only two maps in play but still a variety of gametypes, I haven't had hands on time with all of the new stuff yet but i can say that I'm in love with the DMR which is basically the new battle rifle. There is also a needle rifle that can be quite deadly.
RE: the class system, things seem pretty basic right now but I assume they will mix it up a bit later on, I've only played one gametype where class was decided by weapon, usually you will pick one of 4 types based on armour abilities
scout - fast running.
guard - very short term invincibility - you do leave yourself open here because you basically freeze on the spot.
airborne - jetpacks, YEAH!
stalker - active cammo
Here's my service record, i started out pretty poorly but i'm starting to level out a bit, now that i'm pressing the right buttons..
http://www.bungie.net/Stats/Reach/default.aspx?player=IOOIOIIOOIO
c3px, If your mood lightens, i'll probably be playing it on and off a fair bit during the weekend, gonna get the boys around and try some split screen, party up stuff.
I think today or tomorrow they are unlocking more gametypes so it should feel fresh again.
I agree that it's a hassle the way they chose to deploy the beta - they should have let us download it, or most of it at liesure leading up to the big day then just let people in when the time is right. Rather than having to leave my xbox logged into the ODST main menu for HOURS on end.