Horrible high noses. (Almost) anything before Tyrrell's 019 is good. Anything after is disgusting.
You are pretty much correct of course, but I think the 019 Tyrell (and 020) were actually pretty neat considering they are high-nosed and there were still a lot of very pretty cars from the early 90s. Some lovely cars from that era:
'91+'92 Williams Fw14/14B
'92 + 92 March 911
'91 + '92 Jordan 191/192
'92 + '93 + '94 Lotus 107/107b/109
'95 Ferrari 412 T2
'93 + 94 McLaren Mp4/8 and Mp4/9
92 Andrea Moda (yes!)
Note that pretty much all of these have low, or lowish noses. Soon after this due to the Tyrell (and others) cars did indeed get seriously ugly. The last nice one is surely that 1995 Ferrari.
I think the Benetton B191 was much uglier than the Tyrell 020, however, with a horrible high nose and dumpy looking lines:
