You really think its possible to spam those units?
I once faced 5 Tigers in a single match, and it was a 1v1.
It wasn't even a map control issue. We both had exactly half of the map and put caches down on every point, but he just went hardcore defensive.
I had the VPs so I figured I'd wait him out, but I guess I forgot that he had the heavy armor. If I hadn't built Jacksons then I doubt I would've survived the first four Tigers, meanwhile any Shermans I made were totally useless. P47s helped too.
So if you can get 5 Tigers in a 1v1 with even map control, then I'd say yeah, they're spammable. If you save your fuel until Tigers unlock then it's not inconcievable to have enough saved up to spam them. If you see one Tiger, then you can rest assured that another is on the way, and they'll just keep on coming until the game ends.
On the subject of the T-34...
They definitely feel pretty subpar. Really if it wasn't for the halftrack I'd probably go T4 every time, but the mobile reinforcement is great. Dank Hunter Tactics is nice too; the salvage kit lets me really churn the things out, and makes it safe for me to ram and lose the tank with no real penalties. At that point I start using the T-34s as AT mines against anything bigger than a PzIV.
Sure would love to have a tank that actually threatens infantry, though. The MG on that thing must be shooting blanks because it barely ever kills anything even at point blank. It is good at crushing though, so that's nice.