Best counter to T70 (should get Helpinghans Gold Seal of Approval®):
http://www.youtube.com/watch?v=UiBUW8gZ0RU
I dont think there are any top player that dislike T70 spam more than Helpinghans. If you dont like playing as the underdog against T70 (or early P4/Ostwind as Soviet), just learn from Helpinghans and Vonivan and then abuse the crap out of cons or osttruppen spam to control and/or deny both fuel points. Deny the fuel and no more worry about early T70 or P4 spam.
In 1vs1 tier-0 spam (cons and osttruppen) are OP for both factions because they can potential control or deny both fuel points from your opponent.
For germans if you dont spam osttruppen against someone with equal skill you'll at best be able to keep one fuel point (not both). If you mess up and get flanked its pretty much gg. Risk vs reward, there are no good reasons to tech early because Tier-0 spam work the best to cap and then tech to whatever you want once you have map dominance..
Soviet dont even have a choice and has to spam cons because T1/T2 building time are to long.
On higher level play, german halftrack can also be used to control and/or deny fuel but risk vs reward they are not worth it for less experienced players. Even high level players sometimes overextend the halftrack or dont use it to deny fuel.
Bottom line, tier-0 spam are boring to watch and play with. Just decide for yourself if you want to win games or play for fun.
EDIT: Dont build 6 osttruppen squads like Hans. Require to much micro for less experience players, just build 3-4 to cap and then tech to whatever you want.
