The wiki says they are accused of it but lists many reports which found no evidence of this. In the current conflict there are apparently a couple of cases with hostages.
The big problem with most of these claims is that it's "proximate" shielding being alleged, which is not when you are literally shielding someone (as in the recent cases with Israel using Palestinians, and assumedly those with Hamas using the hostages), but when you are just sat at home, in school, whatever, going about your usual business totally unaware. But you are a "shield" because the enemy decides they want to attack something near you.
This quote really sums up the rhetorical strategy:
"Israeli citizens in Tel Aviv are not classified as shields when Hamas launches rockets towards the Israel Defense Forces military command headquarters located in the city center. By sharp contrast, Palestinian civilians are cast as human shields when Israel bombs Hamas command centers and military infrastructures in Gaza. In other words, if Hamas kills Israeli civilians, it is to blame, and if Israel kills Palestinian civilians, then Hamas is also to blame, since, at least ostensibly, it is Hamas that has deployed these civilians as shields."
It is a trick so that Israel can avoid responsibility for it's actions. I'm not saying you are supporting Israel or denying their crimes (I know you explicitly didn't), but this rhetoric is WAY more common than genuine instances of human shielding, which thus far has primarily been done by Israel, not Hamas.
Likewise, this isn't excusing Hamas. Fuck them. But aside from the case with the hostages (didn't check the reference but I trust it), there is very little evidence that Hamas does this. Most of the time it is an outright deception.
Edit: this is from the report cited by wikipedia:
A witness said that as Israeli forces advanced, the fighters phoned the Israeli police using one of the hostages as an interpreter, identified themselves as from the Qassam Brigades, and told the police that they would shoot those they held if the Israeli forces fired on them. During the standoff, the attackers forced about half the hostages into the yard of the home between Israeli forces and the fighters, according to two witnesses the New York Times interviewed. A man the attackers said was their commander took off his clothing and took Yasmin Porat, one of the hostages, outside to shield him as he surrendered to the Israelis. After the fighters fired again at the Israeli forces, an Israeli tank opened fire on the home. The fighters were killed, as well as 12 hostages who were killed in the crossfire.
So clearly it does happen. But cases are rare and on both sides of the conflict
Why not "very high" then?
MBFC: