The QF wasn't the sole cause of that match being so stalemated. When you have 2 teams of incredibly close skill/experience in a situation where it is better to play safe, the QF was just the cherry on top of an already slow pace. When money/titles are on the line, teams will play more cautious regardless of the medi gun being used (see enigma's examples). A semi-decent counter for QF is running a heavy due to concentrated dmg output....the problem being the heavy's speed of course. Gullywash last is hard to push as is...watching a heavy push last, or the dreaded heavy vs heavy at last + QF was just painful to see.
The QF has a lot of viable features that i'd love to see stay. The quick overheal and the reduced knockback (which correct me if i'm wrong, is finally a nice counter to being gayed by a pyro at choke points - which i hate seeing even more than heavy's) are great adds. The best part in my opinion is the increased movement it gives the medic. This allows for an entire new style to play the class - the medic can choose to be aggressive or defensive with many more options while healing different classes. This is the best change the game has seen in quite sometime imo.
What i personally don't like, is the insane superheal it gives the medic. It does appear to be overpowered in it's current state. Having to have 2 or 3 people focus the medic to try and kill him (only to fail) is pretty insane...especially while having to fight whoever is getting flashed with the QF uber.
Remember this video??
http://www.youtube.com/watch?v=sBJnfB7O9qw&hd=1
I mean the guy domes the medic 3 times in 5 seconds and he doesn't die...that's just crazy lol. A good fix to this is either cap the medic's health (no overheal to med with quickfix and retain heal speed), or reduce the heal speed to the medic during QF uber. Krtiz is a counter, but the current QF charge speed (added with the fast heals) can allow the QF team to play ultra aggressive and get to a med much easier before the kritz is charged...especially if they know the team is running kritz (just takes 1 good call at mid). The team running QF will almost always have the advantage.
I don't necessarily agree with the ban, but i can understand where some people are coming from. Everyone freaked out after 1 match, which really should not have been judged as the sole example. I would love to see the weapon tweaked as it can really add an entire new dimension to competitive play.