Actually, almost no patents are entitled to injunctions since the eBay decision made courts apply the same standard to patent cases as to other injunction requests, and we all owe many thanks to the Supreme Court for that.

some SEPs are pretty low grade too

Indeed, the Microsoft v. Motorola patents were particularly lousy. One Motorola patent was on the use of a particular number as a key in an error correcting code. The code itself was prior art but any two devices needed to use the some identical arbitrary key to communicate. It's embarrassing that the PTO allowed that one, but the court is making Microsoft pay for every device shipped now. Fortunately the price is small.

The Apple v. Samsung case involved a few Samsung radio channel efficiency patents that the jury found not infringed even though Apple did infringe them. They were probably as invalid as all the utility patents in the case but they failed to be useful probably because they were complicated and juries don't pay much attention to technological patents or discussions of them.

Apple's garbage patent about bounce-back was much more effective. Juries can measure that.

Now SEP (standards essential) patents are much less useful because judges are not inclined to allow them to be used defensively. And arguably valid patents are slightly more powerful than clearly erroneous ones. But simple garbage patents focused on non-technological UI and superficial means of doing business are much more effective in all litigation than actual technological patents independent of SEP status or validity.