Need to imporve terran play (team games)

I will consider my self as a fairly decent player. Played the original SC when i came out back in 98' (?) and started playing SC II back in December when I finally had some spare time. I am not a 1v1 player as I prefer playing with friends. Playing randomly Im a high gold player (I know its not impressive compared to others) playing both zerg and protoss. However wit terran it is another story. Back in the original SC I was as good with terran as I was with protoss, much tank to the medics, stim packs and the long rocket range of upgraded goliaths vs air units. Now in SCII I just cant manage to play terran well, unless we are 3 or 4 terran and go mass marines. Early game I do mange, even though I often fail when attacking first (around the 9min mark). Mid/late game I just cant seem to get the right mixture of a well mixed tier 1 & 2 terran army. What should the ratio between medvacs and mm be? Sieges usually get picked off with colossus or carriers, and they need alot of micro. Thors are soooo slow, playing a 4v4 map usually means covering some distance.

Anyone got any good tips on how to improve playing terran in 4v4/3v3 and 2v2? Are sieges the way to go mid game (ofcourse all this is up to what the opponent counter with), but in general is there any fairly straight forward terran tacts that I could try out?


Edit: Also forgot to mention I find it alot harder to expand with terran (unless using liftoff to an island) compared to protoss and zerg. Protoss you can just build a nexus and a few cannons. Voids/carriers can easily take down a small speedling harass, with zerg the nydhus canal lets you be really flexible. Also zerg moves quicly on creep. However with terran it just seems like they always need to be in huge numbers to withstand even the smallest harassments. Also I might use the scan too much, and perhaps I should save more and spend on mules...

Edit #2: Yes, I've been watching alot of vids on youtube - still does not help much other than improving my start

 

Hmmm... Taking an expo with terran seems quite easy to me tbh... If you're unsure on how to defend it, just sacrifice some economy and make it a planetary fotress... With a couple of turrets and the workers to repair it it's pretty much as fortified as it can get, and you can make the cc in your base and transfer it at your leisure when feeling safe instead of having it attacked while being built...

If you wanna practice stuff and discuss replays, and you are on the EU, add me to your friends and call me in for some matches... I'm interrested in learning T and Z a bit too, I'm fairly ok with terran and fairly bad with zerg , so I'd be up to play any matchup against your T so you could try out stuff like unit compositions etc...

If you want you can upload a replay where you're unsure of your critique or what you could have done better and the community here can give you tips and advice on what they think you should have done better...

Btw, my info is on my sig