MUCH better. I was gettiing so unbelievably tired of seeing 50 CP Magikarps in gyms. It was so sad knowing that putting defending Pokemon in not only made no difference, but was actually bad for you. Since the gym would be gone in 30 minutes it just meant more use of potions/revives.
Now there is at least SOME incentive to power up a gym, and to work on solid defenders. Sure, it can still be toppled by one determined player, but at least it won't be a lvl 4 gym that takes them 3 minutes.
In our area at least so far it seems like things are working out nicely. Each team has one level 10 gym so far but the middle gyms in town all still turning over - but at least I'm seeing some get to lvl 7 or 8 and last a day before they switch.