Yep, a 1x12 combo will be fine/too-loud for pub gigs.
I did hundreds of gigs with a 50W mv 1x12 combo - and like HTH says, get it up off the floor, otherwise you won't think it's loud enough (everyone else, including the audience, will! :lol:)
BUT! - I think it's all to do with personal taste (combos v cabs with 2 or more speakers), or possibly what you're used to.
I nearly bought the stack version of my amp (this was many years ago, luckily the drummer pointed out we didn't have our own transport :lol:) ... but a few years later I did a couple of gigs with 4x12. We were both convinced we ought to be doing the "manly" rock-guitar-band thing. One gig was with my combo amp running through a friends 4x12 cab, the other was using the equivalent Marshall head to my Laney amp - in both cases, I absolutely HATED it.
I was actually really disappointed how much I hated the sound of a stack. So I even talked to members of the audience after. Out front, the difference wasn't that great apparently, except maybe that the guitar seemed less focussed and "in-yer-face" than usual. Guitarists suggested that I persevere with the stack idea, all non-guitarists said "why?...".
I stopped lusting after the walls-of-speakers thing then and I've never looked back... :D
It is "different" - you might like it, you might not.
