I don't have one or two names but quite a few.

Most underrated batsmen since I started watching cricket:(or not given the due they really deserved/ records dont tell exactly how great they were)
1. Saeed Anwar (one of the finest leftie ever)
2.Aravinda DeSilva (far better than many present day "GREATS")
3.Arjuna Ranatunga (Superb player,dont go at his build, super batsman)
4.Azharuddin (The artist)
5.Damien Martin
6.Nathan Astle (Capable of playing the way only he could)
7.Graham Thorpe( The Ranatunga of England)
8.Carl Hooper(Probably the best batsman of WI after Lara in the 90s)
9.Gary Kirsten(SA's best batsman in the 90s)
10. Hansie Cronje (some of the astonishing innings against Murali and Akhtar at their peak)

Most Underrated Allrounders

1.Lance Klusener (Smith kicked him out..hate him for that..Cronje got the best out of hum)
2.Brian McMillan( Amazing batsman, bowler and great Slip Catcher)
3.Wasim Akram(was way more capable with bat than his records show)
4.Chris Cairns( his records won't tell, but to me he was the best allrounder I have watched, capable of changing the course in few overs with bat/ball..)

Bowlers:
1. Srinath (was as good as anyone in mid 90s, but that was spinner's time in India)
2.Jason Gillespie
3.This SA bowler of mid 90s who would get Tendulkar out so many times when he was playing at his peak...Fannie DeVelliers.

Wicketkeeper
1.Khaled Masood (Bangladesh. Perhaps one of the finest keepers around, never got his due coz he played for Bangladesh)
2.