Remember as per Boeing FCTM you do not have to retract the flaps to 15 if you suffer an engine failure on final. You may choose to do so but you can also choose to continue with landing flap set which would be appropriate close in as it would appear the RYR was.
Engine power is relatively low on the approach even with land flap so controllability is not normaly a problem if VMC and you would expect that on most occasions the crew would be able to maintain centerline and glidepath to acceptable limits especially as flight director guidance would still be available.
Given that they had a large flock of birds hit them they may have been denied normal visual queus by the birds and subsequent impacts on the windscreen. Add in an engine failure/surge with associated banging etc then things may well have got rather tricky very quickly and the approach may have started to become unstable leading to a go around decision reinforced by company SOP then subsequently reversed as it became clear the 2nd engine was in trouble too. This then leads to a forced landing situation from a less than ideal position. As with the BA we are very fortunate not to be dealing with a great number of fatalities. Maybe the crew did it all perfectly maybe they did not but it would appear that they suffered a double engine failure and managed to keep everyone alive and without major injuries and for that they should be applauded.
What we all need to consider is what our actions would be if confronted with a similar scenario and training needs to educate people about best practise when confronted by bird strikes leading to engine failure/s on final. The report will be an interesting one but for me the decision to go around and press TOGA is a key one and it may well be that it was the wrong call even though understandable given the emphasis on stable approachs' and possable consequences for not going around if you are not stable. SOPs cannot cater for everything and haveing made the call well done to the crew for reversing it and getting everyone down in one bit.