I do not think a S/C is a daily drive, I have had 13 MR2 Mk1's only one was a Supercharger. You have to race them off the lights, you have to do 90 on the motorway, as a minimum. You think you can balance the throttle so as the light does not come on but you soon forget about it.
I was getting 17mpg - best money I ever spent.
My commute to work is 1.9 miles - I could walk it, when I had the supercharger, it was a 12 mile commute - gotta get it warmed up
I used mine as a daily driver for several years, no problems other than those common to all Mk1s. Even with a big pulley I could easily get over 30mpg when driven sensibly ( rare ) but even driven normally it usually managed over 200 miles between refills ( though I once emptied a full tank in under 60 miles, but that was on a trackday at Anglesey )
Super unleaded is a must though - I normally used Tesco 99RON with no problems.
I used my Mk1b NA as a daily for 6 years. It wasn't unreliable per se, but 'something' always needed doing and that 'something' was usually expensive and/or time consuming and always necessary and at a massively inconvenient time. After rolling around in the snow doing lord knows what for the MOT, I decided enough was enough, and bizzarely, I now have an 2004 MG (ZT 190+) - which other than dire fuel consumption from the 2.5 V6, is a fantastic car.
Things that were bad about a mk1 as a daily were lack of space to put things, leaks in winter, rust, constant mot worries, lots of maintenence to keep it in good nick, no air con to clear windows/drips on the head as the ice inside melted off the t-bars.
The fuel consumption was great as was the noise and driving it made you forgive it everything else! Although I loved it dearly, I still don't think it would be my first choice for a daily again though, I think a MX-5 is a better proposition for a 2 seater sports car, or something like an S14 if you needed more room. (P.S if you have a description of your MG's problems, let me know, my mate owns an MG specialists and may know whats causing the prob!!)
I used my sc as a daily drive for 2 years. The thing is I love it so much and couldn't bear to see it deteriorate over time (I want to enjoy it for eternity) so it now is only used for 6 months of the year in dry weather in order to preserve it) this may actually be destroying it in other ways...sitting idle in the garage for 6 months in winter.
What I really need to get to grips with is this obsession with it, it is rationally only a metal box with engine and wheels and would stand up to daily use regardless of weather conditions and local authority road saltings. If I rigorously keep on top of maintainance and hose it down with fresh water weekly and waxoyl it when necessary in winter it would survive.
I think one is perfectly usable as a daily drive, shouldn't require anymore servicing than any other car of that era. It is impractical for those of us who like to lug stuff from the builders merchants or carry muddy wets dogs around.
Depending on the condition of the car at outset, if you get a good one you can keep it that way, if you get a wrong-un then the problems are the fault of the car condition not the model. With sufficient mechanical commitment you could use most older cars as a daily drive and why not if you want to.
I too, never could take a direct drive home and my right foot couldn't stop pressing harder than necessary. I think I have it right for me, drifting to work in my daily £600 sh1tter and thrash the sc on summer weekends going nowwhere in particular.