IMO it's reasonably paid. We aren't well paid, but we aren't badly paid either.
A lot of the issues some might have (apart from those who've been here years) would probably relate to the contracted hours more than anything, being part time.
I've done all sorts of jobs in all sorts of sectors. The "best paid" (for the time) was another unskilled job in a factory doing things like cleaning, putting labels on bottles, putting lids on, slicing cheese, boxing things up and palletising. Bit of overtime got me in the 40% tax bracket (ok quite a bit of OT tbf) around 20 years ago. I did hate the job though.
Been through all sorts of other stuff, in no particular order:
Driving (summer heat was intolerable stuck in a cab with what felt like an asthmatic blowing through a straw for "ventilation", and the bottle of warm yellow stuff for company. Lots of time pressure and entitled muppets "bending" the rules thinking their 5 minute jaunt to the hairdressers was much more important than the load you have in the back, with no regard to you having to conform to your tacho)
Construction (paid myself through college for years to get a trade, but ended up stuck in abusive pay schemes that the entire industry bought into whereby you're forced to pay just to get your wage, provided through a blatant [imo] tax fiddle [no idea if this still goes on], plus you never know if you've got a job next week, or how far you'd be commuting. As has been mentioned too: it's dangerous. Seen a couple of "life changing" accidents and a death on the sites I worked on)
Warehousing (one of the most "enjoyable" jobs in this, forklifting round a company yard on nights in summer. Just me, forklift, and a walkman. Pay was almost non-existant though)
Fiberglass factory (can't sleep due to the constant itching which went on for weeks after I quit. pay was crap too)
We could be better paid, and given the circumstances we work in we probably should be, but it isn't at "bad" pay levels IMO. I'll be blunt though: every single job out there has it's upsides and downsides. Until you try them you have no clue what goes on (bear in mind the people that seem to think we just deliver to their street then go home. You may be taking that line of thinking about any other job out there).