I'm Czech and I don't really know anyone that "loves" Pilsner (although I have heard of such people, so they do exist). It is overpriced, but decent and usually available at least bottled. When other options suck, this one is the go-to. Like a McDonalds of beer I guess. They recently introduced new 0,3l bottles "due to costumer demand", which is pure lunacy.
They also introduced a new beer "proud", trying to market it to younger generations due to young people not drinking enough beer (this conception seems to be false in my friend circle, but maybe), it tastes terrible, too sweet. They also own a lot of the other breweries here, including some I like, which sucks.
I haven't drank much Budweiser, and I don't think I've even seen them on tap in pubs. I think they do mainly export.
From the traditional beers I like the most I'd probably mention Poutník, Radegast, Březňák and Bernard. Bernard has the best bottles with the old-school ceramic caps imo. If you see some of those, I'd recommend trying them out.
But over all I think it's almost always gonna be better to just find a local brewery that makes good beer you can drink from the tap of a pub, rather than shipping beer halfway across the world just due to the country of origin.
Damn, I'd like a beer right about now, unfortunately there are none in my fridge
