Don't Starve and Binding Of Isaac are two of the best games I have played this gen. Whether that is enough to justify the cost of Plus is a different argument but some very good games have been included with the service (indie or not).
There's nothing wrong in bundling some indies. The problem is in the fact that they practically don't bring anything else.
If the Plus/IGC proposed itself initially as a 50€/year subscription for getting dozens of indies, it would have never been successful.
IGC has been terrible, Sony knows this perfectly and they have no intention on getting it better. That's why they hiked the prices of the monthly and trimester subscriptions but kept the yearly one. They can't have people deciding on each month's releases either to pay for plus or not (result would be disastrous), so they make everyone pay for a full year and hope it'll get better over time (it won't).
And it's not about the bundled Indies being good or not. Up to the PS4's release, IGC was about sheer ridiculous value, and now the value is just terrible.
Most of these indies being bundled have been available on Humble Bundles, Bundle Stars, Indie Gala, and lots of other packets that you can buy for 2€ or less.
Take this month's poster-child: Super Meat Boy. It's a ~3 year-old Indie that was in a Humble Bundle in June on the $1 option.
Don't Starve has been sold for 2.5€ several times and Binding of Isaac was also in a Humble Bundle 2 years ago in the $1option.
If someone just wants to play Indies, for crap's sake don't let them get a PS4 + IGC for that, it's ridiculous.
It'll be much cheaper to just get an Intel Compute Stick for $100 and then shop for indie bundles. Plus, they'll actually
own the games and not be tied to a 50€/year (or more) subscription to play them.