i have a bop with only a couple of heals and sadly i all to often see i am near the top of the healing lists, sometimes the top. Granted a lot of that will have gone towards keeping my sorry arse alive but i see cruisers with what i can only consider pitiful heal amonts.
I have seen some cruisers on both sides do some incredible work keeping themselves and others up, if they can do it, then it just shows it can be done. Next time you are in a group with one of those try asking them what they do, you will find most of the time it is not magic. There is a surprisingly small step between a bad player and a decent player and a decent player and a good player.
Good dps is required, but good cruisers win games.