One easy way to find out if it's 'good' or 'bad' for you is to enter what are called 'freeroll' tournaments.
Many poker players who play online don't realise that you can actually play poker completely for free and still win real money. This is done by playing in 'freeroll' tournaments.
Freeroll tournaments are very simple to explain: you play for free with no cost required to join the table and the online poker room still offers real money prizes to the winner(s).
You can read more about them here:
http://www.casinotimes.co.uk/uk-online-poker/uk-online-poker-freeroll-tournaments.htm
Most of the popular online poker rooms have regular freeroll poker tournaments, including Party Poker who you can visit here:
http://www.casinotimes.co.uk/redirect/partypoker.htm
and William Hill Poker, who can be reached here:
http://www.casinotimes.co.uk/redirect/williamhillpoker-uk.htm