I just finished Aliens of London/World War Three, and have to say that if I'd known that Doctor Who had produced this kind of Indiana Jones/Flash Gordon-esque B-movie space adventures, it wouldn't have taken me this long to dive into the series.
I wasn't really sold at first on Jackie and Mickey, finding both to be rather annoying or ineffective in "Rose", but these two episodes changed my opinions on them and I actually liked them here.
The Slitheen were really interesting in design, execution, and appearance, both in terms of their "natural" forms and in their "human suit" disguises. I didn't even mind the ridiculously childish fart jokes associated with them.
I also really liked that Asian doctor lady and Harriett Jones, and apparently both are recurring characters for both the DW series itself and the broader DW franchise in general.
These two episodes were both pretty great and well-executed in terms of narrative and pacing, and would've definitely made me watch the series before now if I'd known about their existence.
As an aside, I found a nuWho podcast that I've started listening to, and the hosts, while being fairly biased towards later seasons of the series and showtunner Steven Moffatt, are still surprisingly fair to this "era" of the show. They're also extremely entertaining, so it should be fun to listen to them going forward.